def hydrolise(mol):
peptide_bond = Chem.MolFromSmiles('C(=O)NC')
ester_bond = Chem.MolFromSmiles('C(=O)OC')
peptide_ids = mol.GetSubstructMatches(peptide_bond)
ester_ids = mol.GetSubstructMatches(ester_bond)
nm = Chem.EditableMol(mol)
bonds_ids = []
for x, _, y, __ in peptide_ids:
nm.RemoveBond(x, y)
bonds_ids.append(
nm.AddBond(x, nm.AddAtom(Chem.Atom('O')), Chem.BondType.SINGLE))
for x, _, y, __ in ester_ids:
nm.RemoveBond(x, y)
bonds_ids.append(
nm.AddBond(x, nm.AddAtom(Chem.Atom('O')), Chem.BondType.SINGLE))
h_m = nm.GetMol()
fragments = Chem.GetMolFrags(h_m, asMols=True)
print()
if len(fragments) == len(peptide_ids) + len(ester_ids):
print('Cyclic structure!', end='')
elif len(fragments) == len(peptide_ids) + len(ester_ids) - 1:
print('Linear structure!')
else:
print('Unknown molecule topology!')
return fragments
def delete_bonds(mol, bonds, ftype, hac):
#use the same parent mol object and create editable mol
em = Chem.EditableMol(mol)
#loop through the bonds to delete
#print "Breaking bonds between atoms: ",bonds
for b in bonds:
#remove the bond
em.RemoveBond(b[0], b[1])
#now add attachement points
newAtomA = em.AddAtom(Chem.Atom(0))
em.AddBond(b[0], newAtomA, Chem.BondType.SINGLE)
newAtomB = em.AddAtom(Chem.Atom(0))
em.AddBond(b[1], newAtomB, Chem.BondType.SINGLE)
#should be able to get away without sanitising mol
#as the valencies should be okay
modifiedMol = em.GetMol()
#do not sanitise!
#Chem.SanitizeMol(modifiedMol)
fragmented_smi = Chem.MolToSmiles(modifiedMol, True)
#print fragmented_smi
fraggle_framentation = select_fragments(fragmented_smi, ftype, hac)
return fraggle_framentation
def fragment_into_dummy_smiles(offmol, cleave_bonds=[], unique_r_groups=True):
rdmol = Chem.RWMol(offmol.to_rdkit())
for atom in rdmol.GetAtoms():
atom.SetAtomMapNum(0)
utils.assign_stereochemistry(rdmol)
dummy = Chem.Atom("*")
r_linkages = {}
if unique_r_groups:
r_groups = [(i, i + 1)
for i in range(1, (len(cleave_bonds) + 1) * 2, 2)]
else:
r_groups = [(1, 2)] * len(cleave_bonds)
for bond, rs in zip(cleave_bonds, r_groups):
bond_type = rdmol.GetBondBetweenAtoms(*bond).GetBondType()
rdmol.RemoveBond(*bond)
r_linkages[rs[0]] = [rs[1]]
for atom_index, r in zip(bond, rs):
dummy_copy = Chem.Atom(dummy)
dummy_copy.SetAtomMapNum(r)
new_atom_index = rdmol.AddAtom(dummy_copy)
rdmol.AddBond(atom_index, new_atom_index, bond_type)
mols = Chem.GetMolFrags(rdmol, asMols=True)
for mol in mols:
counter = 1
Chem.AssignStereochemistry(mol)
for atom in mol.GetAtoms():
if atom.GetSymbol() != "*":
atom.SetAtomMapNum(counter)
counter += 1
smiles = [utils.mol_to_smiles(m) for m in mols]
return smiles, r_linkages
def HToOtherElement(m, cn_idx, Z=None):
"""
arguments: mol object, connection atom index, Z (optional)
returns: new mol object
this function replaces a H atom bound to an atom with index cn_idx with another atom with atomic number Z
"""
print('chose HToOtherElement')
if Z == None:
Z = choice(Z_list) #pick random element
mw = Chem.RWMol(m)
for at in mw.GetAtomWithIdx(cn_idx).GetNeighbors():
if at.GetSymbol() == 'H':
H_idx = at.GetIdx()
break
mw.ReplaceAtom(H_idx, Chem.Atom(Z))
Chem.SanitizeMol(mw)
#add Hs to satisfy the valence of the new atom
while len(mw.GetAtomWithIdx(H_idx).GetNeighbors()) < mw.GetAtomWithIdx(
H_idx).GetTotalValence():
idx = mw.AddAtom(Chem.Atom(1))
mw.AddBond(H_idx, idx, Chem.BondType.SINGLE)
Chem.SanitizeMol(mw)
AllChem.EmbedMolecule(mw)
AllChem.MMFFOptimizeMolecule(mw)
return mw
def split_heterocycle_bonds(rwmol, bonds):
# TODO: sometimes adds OH when rBAN doesn't (when valence == 1 and type == HETEROCYCLE),
# but in other cases (e.g. val == 1, type == Oxazole), the result matches w/ rBAN
carbon_ends = set()
for b_idx in sorted(bonds, reverse=True):
b = rwmol.GetBondWithIdx(b_idx)
st_ = b.GetBeginAtomIdx()
end_ = b.GetEndAtomIdx()
rwmol.RemoveBond(st_, end_)
for a in (st_, end_):
if rwmol.GetAtomWithIdx(a).GetSymbol() == 'C':
carbon_ends.add(a)
for a in carbon_ends:
atom = rwmol.GetAtomWithIdx(a)
atom.SetNumExplicitHs(0)
atom.UpdatePropertyCache()
valence = atom.GetExplicitValence()
if valence == 1:
new_id1 = rwmol.AddAtom(rdc.Atom(8))
rwmol.AddBond(a, new_id1, rdc.BondType.SINGLE)
new_id2 = rwmol.AddAtom(rdc.Atom(8))
rwmol.AddBond(a, new_id2, rdc.BondType.DOUBLE)
elif valence == 2:
new_id2 = rwmol.AddAtom(rdc.Atom(8))
rwmol.AddBond(a, new_id2, rdc.BondType.DOUBLE)
elif valence == 3:
new_id2 = rwmol.AddAtom(rdc.Atom(8))
rwmol.AddBond(a, new_id2, rdc.BondType.SINGLE)
return rwmol
def ReadSymbols(self, tree):
if tree[0] in ['any atom', '$']:
atom = rdqueries.AtomNumGreaterQueryAtom(0)
elif tree[0] in ['heteroatom', '&']:
#N, O, P, S
atom = rdqueries.AtomNumEqualsQueryAtom(7)
atom.ExpandQuery(rdqueries.AtomNumEqualsQueryAtom(8),\
how=Chem.rdchem.CompositeQueryType.COMPOSITE_OR)
atom.ExpandQuery(rdqueries.AtomNumEqualsQueryAtom(15),\
how=Chem.rdchem.CompositeQueryType.COMPOSITE_OR)
atom.ExpandQuery(rdqueries.AtomNumEqualsQueryAtom(16),\
how=Chem.rdchem.CompositeQueryType.COMPOSITE_OR)
elif tree[0] in ['heavy atom', 'X']:
# heavier than H
atom = rdqueries.AtomNumGreaterQueryAtom(1)
elif tree[0][0].islower():
# aromatic molecule
symbol = tree[0][0].upper() + tree[0][1:]
try:
atom = Chem.Atom(symbol)
atom.SetIsAromatic(True)
except RuntimeError:
msg = 'Element aromatic ' + symbol + ' not found'
raise RINGReaderError(msg)
elif tree[0] == 'M':
# metal
atom = rdqueries.AtomNumGreaterQueryAtom(19)
else:
try:
atom = Chem.Atom(tree[0])
atom = rdqueries.AtomNumEqualsQueryAtom(atom.GetAtomicNum())
except RuntimeError:
msg = 'Element ' + tree[0] + ' not found'
raise RINGReaderError(msg)
return atom
def split_hetero(rwmol, bonds):
carbon_ends = set()
for b_idx in sorted(bonds, reverse=True):
b = rwmol.GetBondWithIdx(b_idx)
st_ = b.GetBeginAtomIdx()
end_ = b.GetEndAtomIdx()
rwmol.RemoveBond(st_, end_)
for a in (st_, end_):
if rwmol.GetAtomWithIdx(a).GetSymbol() == 'C':
carbon_ends.add(a)
for a in carbon_ends:
atom = rwmol.GetAtomWithIdx(a)
atom.SetNumExplicitHs(0)
atom.UpdatePropertyCache()
valence = atom.GetExplicitValence()
if valence == 1:
new_id1 = rwmol.AddAtom(rdc.Atom(8))
rwmol.AddBond(a, new_id1, rdc.BondType.SINGLE)
new_id2 = rwmol.AddAtom(rdc.Atom(8))
rwmol.AddBond(a, new_id2, rdc.BondType.DOUBLE)
elif valence == 2:
new_id2 = rwmol.AddAtom(rdc.Atom(8))
rwmol.AddBond(a, new_id2, rdc.BondType.DOUBLE)
elif valence == 3:
new_id2 = rwmol.AddAtom(rdc.Atom(8))
rwmol.AddBond(a, new_id2, rdc.BondType.SINGLE)
return rwmol
def IonizeAtom(mol, atomI, ion_mode):
ionized_mol = []
charge = []
if ion_mode == "protonated":
charge = 1
ionized_mol = Chem.RWMol(mol)
H = ionized_mol.AddAtom((Chem.Atom(1)))
ionized_mol.AddBond(atomI, H, Chem.BondType.SINGLE)
ionized_mol.GetAtomWithIdx(atomI).SetFormalCharge(charge)
if ion_mode == "sodiated":
charge = 1
ionized_mol = Chem.RWMol(mol)
Na = ionized_mol.AddAtom((Chem.Atom(11)))
ionized_mol.AddBond(atomI, Na, Chem.BondType.SINGLE)
ionized_mol.GetAtomWithIdx(atomI).SetFormalCharge(charge)
if ion_mode == "deprotonated" and mol.GetAtomWithIdx(atomI).GetTotalNumHs(
includeNeighbors=True) > 0:
charge = -1
ionized_mol = Chem.RWMol(mol)
for atom in ionized_mol.GetAtomWithIdx(atomI).GetNeighbors():
if atom.GetAtomicNum() == 1:
H = atom.GetIdx()
ionized_mol.RemoveAtom(H)
ionized_mol.GetAtomWithIdx(atomI).SetFormalCharge(charge)
if ionized_mol:
AllChem.EmbedMolecule(ionized_mol, potential)
return ionized_mol, charge
def join_mols(mol):
'''join fragged mols, based on dummy atom positions'''
#dummy_atoms = find_dummy_atoms(mol)
#print dummy_atoms
#print dummy_atoms[0][0]
#temp_em = Chem.EditableMol(mol)
#temp_em.RemoveAtom(dummy_atoms[-1][0])
#temp_em.RemoveAtom(dummy_atoms[-2][0])
#temp_em.ReplaceAtom(dummy_atoms[1][0],Chem.Atom(6))
#temp_em.ReplaceAtom(dummy_atoms[0][0],Chem.Atom(6))
#temp_em.AddBond(dummy_atoms[0][0],dummy_atoms[-2][1][0],Chem.BondType.AROMATIC)
#temp_em.AddBond(dummy_atoms[1][0],dummy_atoms[-1][1][0],Chem.BondType.AROMATIC)
#tm = temp_em.GetMol()
#Chem.SanitizeMol(tm)
dummy_atoms = find_dummy_atoms(mol)
print dummy_atoms
#print dummy_atoms[0][0]
temp_em = Chem.EditableMol(mol)
temp_em.ReplaceAtom(dummy_atoms[1][0],Chem.Atom(6))
temp_em.ReplaceAtom(dummy_atoms[0][0],Chem.Atom(6))
temp_em.ReplaceAtom(dummy_atoms[-1][0],Chem.Atom(6))
temp_em.ReplaceAtom(dummy_atoms[-2][0],Chem.Atom(6))
#temp_em.AddBond(dummy_atoms[0][0],dummy_atoms[-1][0],Chem.BondType.AROMATIC)
#temp_em.AddBond(dummy_atoms[1][0],dummy_atoms[-2][0],Chem.BondType.AROMATIC)
#temp_em.ReplaceAtom(dummy_atoms[1][0],Chem.Atom(6))
#temp_em.ReplaceAtom(dummy_atoms[0][0],Chem.Atom(6))
temp_em.AddBond(dummy_atoms[0][0],dummy_atoms[-2][1][0],Chem.BondType.AROMATIC)
temp_em.AddBond(dummy_atoms[1][0],dummy_atoms[-1][1][0],Chem.BondType.AROMATIC)
temp_em.RemoveAtom(dummy_atoms[-1][0])
temp_em.RemoveAtom(dummy_atoms[-2][0])
tm = temp_em.GetMol()
Chem.SanitizeMol(tm)
return tm
def add_atoms(new_mol, node_symbol, dataset):
for number in node_symbol:
if dataset=='qm9' or dataset=='cep':
idx=new_mol.AddAtom(Chem.Atom(dataset_info(dataset)['number_to_atom'][number]))
elif dataset=='zinc':
new_atom = Chem.Atom(dataset_info(dataset)['number_to_atom'][number])
charge_num=int(dataset_info(dataset)['atom_types'][number].split('(')[1].strip(')'))
new_atom.SetFormalCharge(charge_num)
new_mol.AddAtom(new_atom)
def test_correct_mol():
mol = Chem.RWMol()
mol.AddAtom(Chem.Atom(6))
mol.AddAtom(Chem.Atom(6))
mol.AddAtom(Chem.Atom(6))
mol.AddAtom(Chem.Atom(7))
mol.AddBond(0, 1, Chem.rdchem.BondType.DOUBLE)
mol.AddBond(1, 2, Chem.rdchem.BondType.TRIPLE)
mol.AddBond(0, 3, Chem.rdchem.BondType.TRIPLE)
print(Chem.MolToSmiles(mol)) # C#C=C#N
mol = correct_mol(mol)
print(Chem.MolToSmiles(mol)) # C=C=C=N
def create_rdkit_molecule(molecule_name, molecules, molecule_numberings,
bonds):
'''
Using dictionaries containing molecule structure create a rdkit molecule.
Args:
molecule_name (str): name of a molecule
molecules (dict): dictionary containing for each molecules a list with a atom numbers and types in the molecule
molecule_numberings (dict): dictionary containing for each molecules a list with a atom numbers in the molecule
bonds (dict): dictionary containing for each molecules the list of its bond in utpels (bond_number_1, bond_number_2, bond_type)
Returns:
rdmol (Mol): the molecule in rdkit Molecule
'''
# Create an editable molecule.
rdmol = Chem.Mol()
rdedmol = Chem.EditableMol(rdmol)
atoms = {
atom_tuple[0]: atom_tuple[1]
for atom_tuple in sorted(molecules[molecule_name])
}
atom_numberings = sorted(molecule_numberings[molecule_name])
# Renumber atom so there is no atom with a number superior to the number of atoms in the molecule.
atom_replaces = {}
for atom in atom_numberings:
if atom != sorted(atom_numberings).index(atom) + 1:
atom_replaces[atom] = sorted(atom_numberings).index(atom) + 1
# Add a first atom to keep most of the atom numbering.
rdatom = Chem.Atom(0)
rdedmol.AddAtom(rdatom)
# Add atoms from the molecule.
# Add absent atoms to keep the atom numbering.
for atom_number in range(max(atom_numberings)):
atom_number += 1
if atom_number in atoms:
atom = atoms[atom_number]
else:
atom = 0
rdatom = Chem.Atom(atom)
rdedmol.AddAtom(rdatom)
# Add bonds from the molecule.
for bond in bonds[molecule_name]:
bond = tuple(bond)
rdedmol.AddBond(bond[0], bond[1], bond[2])
# Create molecule.
rdmol = rdedmol.GetMol()
return rdmol
def test_dative_bond():
smis = "CC1=CC=CC(=C1N\\2O[Co]3(ON(\\C=[N]3\\C4=C(C)C=CC=C4C)C5=C(C)C=CC=C5C)[N](=C2)\\C6=C(C)C=CC=C6C)C"
expected_result = (
"CC1=CC=CC(C)=C1N1C=N(C2=C(C)C=CC=C2C)->[Co]2(<-N(C3=C(C)C=CC=C3C)=CN(C3=C(C)C=CC=C3C)O2)O1"
)
assert dm.is_transition_metal(Chem.Atom("Co"))
# sodium is not a transition metal
assert not dm.is_transition_metal(Chem.Atom("Na"))
mol = dm.set_dative_bonds(Chem.MolFromSmiles(smis, sanitize=False))
assert Chem.MolToSmiles(mol) == expected_result
assert dm.to_mol(Chem.MolToSmiles(mol)) is not None
def split_aa_pk_hybrid(smi):
mol = rdc.MolFromSmiles(smi)
if not mol:
raise PKError
bond_break = find_aa_pk_bond(mol)
mw = rdc.RWMol(mol)
oxs = [
a.GetIdx() for a in mw.GetAtomWithIdx(bond_break[0]).GetNeighbors()
if a.GetAtomicNum() == 8
]
if len(oxs) > 1:
raise PKError
if oxs:
bond_type = mw.GetBondBetweenAtoms(bond_break[0], oxs[0]).GetBondType()
if bond_type == rdc.BondType.DOUBLE:
cond_type = 'KS'
new_ox = mw.AddAtom(rdc.Atom(8))
mw.AddBond(bond_break[0], new_ox, rdc.BondType.SINGLE)
elif bond_type == rdc.BondType.SINGLE:
cond_type = 'KS+KR'
new_ox = mw.AddAtom(rdc.Atom(8))
mw.AddBond(bond_break[0], new_ox, rdc.BondType.DOUBLE)
else:
raise PKError
else:
bond_type = mw.GetBondBetweenAtoms(*bond_break).GetBondType()
if bond_type == rdc.BondType.DOUBLE:
cond_type = 'KS+KR+DH'
elif bond_type == rdc.BondType.SINGLE:
cond_type = 'KS+KR+DH+ER'
else:
raise PKError
new_ox1 = mw.AddAtom(rdc.Atom(8))
new_ox2 = mw.AddAtom(rdc.Atom(8))
mw.AddBond(bond_break[0], new_ox1, rdc.BondType.SINGLE)
mw.AddBond(bond_break[0], new_ox2, rdc.BondType.DOUBLE)
mw.RemoveBond(*bond_break)
aa_part_smi = None
pk_part_smi = None
for frag_atoms in rdc.GetMolFrags(mw):
if bond_break[0] in frag_atoms:
aa_part_smi = rdc.MolFragmentToSmiles(mw, frag_atoms)
else:
pk_part_smi = rdc.MolFragmentToSmiles(mw, frag_atoms)
if (not aa_part_smi) or (not pk_part_smi):
raise PKError
return aa_part_smi, pk_part_smi, cond_type
def de_featurizer(nodes, edges):
'''Draw out a molecule based on the molecules's graph representation with nodes and edges.
Paramenters:
------
nodes: an array of the molecule with atomic numbers
edges: a matrix containing bond information between each atom of the molecule
Return:
------
two possible rdkit molecules(since the generated molecule graph's edges contains diagonally two possibilities of bond informations
'''
mol1 = Chem.RWMol() #initiate two molecules
mol2 = Chem.RWMol()
bond_types = [
Chem.rdchem.BondType.ZERO,
Chem.rdchem.BondType.SINGLE,
Chem.rdchem.BondType.DOUBLE,
Chem.rdchem.BondType.TRIPLE,
Chem.rdchem.BondType.AROMATIC,
]
decoder = {i: j
for i, j in enumerate(bond_types, 0)
} # create decoder of bondtype corresponding with numbers
#create atoms
for atom in nodes:
mol1.AddAtom(Chem.Atom(int(atom)))
mol2.AddAtom(Chem.Atom(int(atom)))
#loop through the matrix to defeaturize bonds
#mol2 = mol1
for a in range(len(edges) - 1):
#for b in range(a+1, len(edges)):
b = a + 1
if 0 < edges[int(a)][int(b)] < 6:
mol1.AddBond(int(a), int(b), decoder.get(edges[int(a)][int(b)]))
else:
mol1.AddBond(int(a), int(b), Chem.rdchem.BondType.SINGLE)
if 0 < edges[int(b)][int(a)] < 6:
mol2.AddBond(int(a), int(b), decoder.get(edges[int(b)][int(a)]))
else:
mol2.AddBond(int(a), int(b), Chem.rdchem.BondType.SINGLE)
return mol1, mol2
def LumpH(molecule):
"""
Lump hydrogen atoms as a single atom. Note that Si, Al, Mg, Na are used as
pseudoatoms. However, this does not affect printing SMILES, as smilesSymbol
are appropriately set.
"""
molecule = Chem.RWMol(molecule)
Hidx = list()
for i in range(0, molecule.GetNumAtoms()):
atom = molecule.GetAtomWithIdx(i)
if atom.GetSymbol() != 'H':
NumH = 0
for neighbor_atom in atom.GetNeighbors():
if neighbor_atom.GetSymbol() == 'H':
NumH += 1
Hidx.append(neighbor_atom.GetIdx())
if NumH == 4:
a = Chem.Atom('Si')
a.SetProp('smilesSymbol', 'H4')
idx = molecule.AddAtom(a)
molecule.AddBond(atom.GetIdx(), idx,
Chem.rdchem.BondType.QUADRUPLE)
molecule.GetAtomWithIdx(idx).SetNoImplicit(True)
elif NumH == 3:
a = Chem.Atom('Al')
a.SetProp('smilesSymbol', 'H3')
idx = molecule.AddAtom(a)
molecule.AddBond(atom.GetIdx(), idx,
Chem.rdchem.BondType.TRIPLE)
molecule.GetAtomWithIdx(idx).SetNoImplicit(True)
elif NumH == 2:
a = Chem.Atom('Mg')
a.SetProp('smilesSymbol', 'H2')
idx = molecule.AddAtom(a)
molecule.AddBond(atom.GetIdx(), idx,
Chem.rdchem.BondType.DOUBLE)
molecule.GetAtomWithIdx(idx).SetNoImplicit(True)
elif NumH == 1:
a = Chem.Atom('Na')
a.SetProp('smilesSymbol', 'H')
idx = molecule.AddAtom(a)
molecule.AddBond(atom.GetIdx(), idx,
Chem.rdchem.BondType.SINGLE)
molecule.GetAtomWithIdx(idx).SetNoImplicit(True)
Hidx.sort(reverse=True)
for i in Hidx:
molecule.RemoveAtom(i)
return molecule
def decode(self, matrix):
frags, smiles = [], []
for m, adj in enumerate(matrix):
# print('decode: ', m)
emol = Chem.RWMol()
esub = Chem.RWMol()
try:
for atom, curr, prev, bond, frag in adj:
atom, curr, prev, bond, frag = int(atom), int(curr), int(
prev), int(bond), int(frag)
if atom == self.tk2ix['EOS']: continue
if atom == self.tk2ix['GO']: continue
if atom != self.tk2ix['*']:
a = Chem.Atom(self.ix2nr[atom])
a.SetFormalCharge(self.ix2ch[atom])
emol.AddAtom(a)
if frag != 0: esub.AddAtom(a)
if bond != 0:
b = Chem.BondType(bond)
emol.AddBond(curr, prev, b)
if frag != 0: esub.AddBond(curr, prev, b)
Chem.SanitizeMol(emol)
Chem.SanitizeMol(esub)
except Exception as e:
print(adj)
# raise e
frags.append(Chem.MolToSmiles(esub))
smiles.append(Chem.MolToSmiles(emol))
return frags, smiles
def _place_between(self, mol: Chem.RWMol, a: int, b: int, aromatic=True):
oribond = mol.GetBondBetweenAtoms(a, b)
if oribond is None:
print('FAIL')
return None # fail
elif aromatic:
bt = Chem.BondType.AROMATIC
else:
bt = oribond.GetBondType()
idx = mol.AddAtom(Chem.Atom(6))
neoatom = mol.GetAtomWithIdx(idx)
atom_a = mol.GetAtomWithIdx(a)
atom_b = mol.GetAtomWithIdx(b)
if aromatic:
neoatom.SetIsAromatic(True)
atom_a.SetIsAromatic(True)
atom_b.SetIsAromatic(True)
# prevent constraints
neoatom.SetBoolProp('_Novel', True)
atom_a.SetBoolProp('_Novel', True)
atom_b.SetBoolProp('_Novel', True)
# fix position
conf = mol.GetConformer()
pos_A = conf.GetAtomPosition(a)
pos_B = conf.GetAtomPosition(b)
x = pos_A.x / 2 + pos_B.x / 2
y = pos_A.y / 2 + pos_B.y / 2
z = pos_A.z / 2 + pos_B.z / 2
conf.SetAtomPosition(idx, Point3D(x, y, z))
# fix bonds
mol.RemoveBond(a, b)
mol.AddBond(a, idx, bt)
mol.AddBond(b, idx, bt)
def find_context(atom_ids, my_mol, my_sub_m, cont_sub):
"""Function to get the context - by adding all the atoms in a substructure and adding them to the fragment"""
# First combine the tuples
# Get the atoms in this match
out_m = []
for x in my_mol.GetSubstructMatches(cont_sub):
for y in x:
# If it's in both substructures
if y in my_sub_m:
out_m.append(y)
# Add the core structure
out_m.extend(atom_ids)
# get an editable mol
em = Chem.EditableMol(my_mol)
# Loop through the atoms and remove them
for my_id in my_mol.GetAtoms():
if my_id.GetIdx() in out_m:
continue
else:
# Replace with a gap
em.ReplaceAtom(my_id.GetIdx(), Chem.Atom(0))
# Now remove all these atoms
star_mol = em.GetMol()
out_mol = Chem.DeleteSubstructs(star_mol, Chem.MolFromSmarts('[#0]'))
out_ans = Chem.MolToSmiles(out_mol)
print "ORIG MOL", Chem.MolToSmiles(my_mol)
print "FRACT MOL", out_ans
return out_ans
def classification_report(data, model, session, sample=False):
_, _, _, a, x, _, f, _, _ = data.next_validation_batch()
n, e = session.run([model.nodes_gumbel_argmax, model.edges_gumbel_argmax] if sample else [
model.nodes_argmax, model.edges_argmax], feed_dict={model.edges_labels: a, model.nodes_labels: x,
model.node_features: f, model.training: False,
model.variational: False})
n, e = np.argmax(n, axis=-1), np.argmax(e, axis=-1)
y_true = e.flatten()
y_pred = a.flatten()
target_names = [str(Chem.rdchem.BondType.values[int(e)]) for e in data.bond_decoder_m.values()]
print('######## Classification Report ########\n')
print(sk_classification_report(y_true, y_pred, labels=list(range(len(target_names))),
target_names=target_names))
print('######## Confusion Matrix ########\n')
print(confusion_matrix(y_true, y_pred, labels=list(range(len(target_names)))))
y_true = n.flatten()
y_pred = x.flatten()
target_names = [Chem.Atom(e).GetSymbol() for e in data.atom_decoder_m.values()]
print('######## Classification Report ########\n')
print(sk_classification_report(y_true, y_pred, labels=list(range(len(target_names))),
target_names=target_names))
print('\n######## Confusion Matrix ########\n')
print(confusion_matrix(y_true, y_pred, labels=list(range(len(target_names)))))
def numpy_to_rdkit(adj, nf, ef, sanitize=False):
"""
Converts a molecule from numpy to RDKit format.
:param adj: binary numpy array of shape (N, N)
:param nf: numpy array of shape (N, F)
:param ef: numpy array of shape (N, N, S)
:param sanitize: whether to sanitize the molecule after conversion
:return: an RDKit molecule
"""
if rdc is None:
raise ImportError('`numpy_to_rdkit` requires RDKit.')
mol = rdc.RWMol()
for nf_ in nf:
atomic_num = int(nf_)
if atomic_num > 0:
mol.AddAtom(rdc.Atom(atomic_num))
for i, j in zip(*np.triu_indices(adj.shape[-1])):
if i != j and adj[i, j] == adj[j, i] == 1 and not mol.GetBondBetweenAtoms(int(i), int(j)):
bond_type_1 = BOND_MAP[int(ef[i, j, 0])]
bond_type_2 = BOND_MAP[int(ef[j, i, 0])]
if bond_type_1 == bond_type_2:
mol.AddBond(int(i), int(j), bond_type_1)
mol = mol.GetMol()
if sanitize:
rdc.SanitizeMol(mol)
return mol
class AtomicProperty(Descriptor):
__slots__ = "explicit_hydrogens", "prop", "_initialized"
def __str__(self):
return "Prop{}".format(self.as_argument)
def get_long(self):
return getattr(self.prop, "long", self.prop.__name__)
@property
def as_argument(self):
return getattr(self.prop, "short", self.prop.__name__)
def parameters(self):
return self.explicit_hydrogens, self.prop
def __new__(cls, explicit_hydrogens, prop):
if isinstance(prop, cls):
prop._initialized = True
return prop
return super(AtomicProperty, cls).__new__(cls)
def __init__(self, explicit_hydrogens, prop):
if getattr(self, "_initialized", False):
return
self.explicit_hydrogens = explicit_hydrogens
self.prop = getters.get(prop)
if self.prop is not None:
return
if callable(prop):
self.prop = prop
return
raise TypeError("atomic property is not callable: {!r}".format(prop))
def calculate(self):
if getattr(self.prop, "gasteiger_charges", False):
ComputeGasteigerCharges(self.mol)
r = atoms_to_numpy(self.prop, self.mol)
nans = np.isnan(r)
if np.any(nans):
atms = set(
np.array([a.GetSymbol() for a in self.mol.GetAtoms()])[nans])
self.fail(
ValueError("missing {} for {}".format(self.get_long(),
list(atms))))
return r
_carbon = Chem.Atom(6)
@property
def carbon(self):
return self.prop(self._carbon)
def to_RDKMol(self):
"""Return an RDKMol object for the configuration, template, or subset."""
index = {}
indices = []
rdk_mol = Chem.RWMol()
for atno, _id in zip(self.atoms.atomic_numbers, self.atoms.ids):
idx = rdk_mol.AddAtom(Chem.Atom(atno))
index[_id] = idx
indices.append(idx)
bond_types = {
1: Chem.BondType.SINGLE,
2: Chem.BondType.DOUBLE,
3: Chem.BondType.TRIPLE,
}
for row in self.bonds.bonds():
rdk_mol.AddBond(index[row["i"]], index[row["j"]],
bond_types[row["bondorder"]])
natom = self.atoms.n_atoms
conf = Chem.Conformer(natom)
for idx, xyz in zip(indices, self.atoms.coordinates):
conf.SetAtomPosition(idx, xyz)
rdk_mol.AddConformer(conf)
Chem.rdmolops.SanitizeMol(rdk_mol)
return rdk_mol
def to_rdmol(plams_mol, sanitize=True):
"""
Translate a PLAMS molecule into an RDKit molecule type
"""
# Create rdkit molecule
e = Chem.EditableMol(Chem.Mol())
for atom in plams_mol.atoms:
a = Chem.Atom(atom.atnum)
ch = atom.properties.charge
if isinstance(ch, int):
a.SetFormalCharge(ch)
e.AddAtom(a)
for bond in plams_mol.bonds:
a1 = plams_mol.atoms.index(bond.atom1)
a2 = plams_mol.atoms.index(bond.atom2)
e.AddBond(a1, a2, Chem.BondType(bond.order))
rdmol = e.GetMol()
if sanitize:
Chem.SanitizeMol(rdmol)
conf = Chem.Conformer()
for a in range(len(plams_mol.atoms)):
atom = plams_mol.atoms[a]
p = Geometry.Point3D(atom._getx(), atom._gety(), atom._getz())
conf.SetAtomPosition(a, p)
rdmol.AddConformer(conf)
return rdmol
def nx_to_mol(G):
mol = Chem.RWMol()
atomic_nums = nx.get_node_attributes(G, 'atomic_num')
chiral_tags = nx.get_node_attributes(G, 'chiral_tag')
formal_charges = nx.get_node_attributes(G, 'formal_charge')
node_is_aromatics = nx.get_node_attributes(G, 'is_aromatic')
node_hybridizations = nx.get_node_attributes(G, 'hybridization')
num_explicit_hss = nx.get_node_attributes(G, 'num_explicit_hs')
node_to_idx = {}
for node in G.nodes():
a = Chem.Atom(atomic_nums[node])
a.SetChiralTag(chiral_tags[node])
a.SetFormalCharge(formal_charges[node])
a.SetIsAromatic(node_is_aromatics[node])
a.SetHybridization(node_hybridizations[node])
a.SetNumExplicitHs(num_explicit_hss[node])
idx = mol.AddAtom(a)
node_to_idx[node] = idx
bond_types = nx.get_edge_attributes(G, 'bond_type')
for edge in G.edges():
first, second = edge
ifirst = node_to_idx[first]
isecond = node_to_idx[second]
bond_type = bond_types[first, second]
mol.AddBond(ifirst, isecond, bond_type)
Chem.SanitizeMol(mol)
return mol
def set_structure(mol, cmat, atom_list):
"""Creates single bonds between atoms based on contact matrix.
Creates single bonds between all connected atoms in contact
matrix.
Parameters
----------
mol : rdkit.Chem.RWMol
cmat : numpy.ndarray
atom_list : list"""
for atom in atom_list:
mol.AddAtom(Chem.Atom(atom))
for i, j in zip(*np.where(cmat[:, :] == 1)):
if mol.GetAtomWithIdx(int(i)).GetSymbol() == 'Li':
continue
elif mol.GetAtomWithIdx(int(j)).GetSymbol() == 'Li':
continue
else:
pass
mol.AddBond(int(i), int(j), Chem.BondType.SINGLE)
for at in mol.GetAtoms():
at.SetNoImplicit(True)
return
def __init__(self,
atom_map1: int,
new_atoms_map_nums: List[int],
ring_key: str,
action_vocab: dict,
is_hard: bool = False):
super(AddRingAction, self).__init__(atom_map1, -1, action_vocab,
is_hard)
self.ring_key = ring_key
# order new atom map nums so map num of the existing atom is first
map_ind = new_atoms_map_nums.index(self.atom_map1)
self.new_atoms_map_nums = [
self.atom_map1
] + new_atoms_map_nums[map_ind + 1:] + new_atoms_map_nums[:map_ind]
new_a = Chem.Atom(6)
new_a.SetIsAromatic(True)
new_a.SetBoolProp('is_edited', True)
self.new_atom_features = get_atom_features(
new_a, ORDERED_ATOM_OH_KEYS, atom_prop2oh=self.prop2oh['atom'])
b_type = Chem.rdchem.BondType.AROMATIC
self.new_bond_features = [
self.prop2oh['bond'][key][val]
for key, val in (('bond_type', b_type), ('bond_stereo', 0),
('is_edited', 1))
]
def graph_to_mol(nodes, adjacency, allow_submolecule=False): global MOSES_ATOMIC_NUM_LIST, MOSES_BOND_DECODER if isinstance(nodes, torch.Tensor): nodes = nodes.detach().cpu().numpy() if isinstance(adjacency, torch.Tensor): adjacency = adjacency.detach().cpu().numpy() invalid_atoms = (nodes < 0) | nodes >= MosesDataset.num_node_types() if np.any(invalid_atoms) and not np.all(invalid_atoms): valid_idx = np.where(~invalid_atoms)[0] nodes = nodes[valid_idx] adjacency = adjacency[valid_idx,:][:,valid_idx] if allow_submolecule: nodes, adjacency = find_largest_submolecule(nodes, adjacency) mol = Chem.RWMol() for n in nodes: if n < 0: continue mol.AddAtom(Chem.Atom(int(MOSES_ATOMIC_NUM_LIST[n]))) for i in range(adjacency.shape[0]): for j in range(i+1, adjacency.shape[1]): if adjacency[i,j] == 0: continue mol.AddBond(i, j, MOSES_BOND_DECODER[adjacency[i,j]]) return mol
def assertBondStereoRoundTrips(self, fname):
path = os.path.join(RDConfig.RDCodeDir, 'Chem', 'test_data', fname)
mol = Chem.MolFromMolFile(path)
refSmiles = mol.GetProp("_Name")
self.assertTrue(len(refSmiles) > 0)
self.assertEqual(Chem.MolToSmiles(mol, isomericSmiles=True), refSmiles)
# now test Chem.DetectBondStereoChemistry more directly by constructing the molecule from scratch
oldconf = mol.GetConformer(0)
newconf = Chem.Conformer(mol.GetNumAtoms())
newmol = Chem.RWMol()
for atm in mol.GetAtoms():
ratm = Chem.Atom(atm.GetAtomicNum())
ratm.SetFormalCharge(atm.GetFormalCharge())
newmol.AddAtom(ratm)
atomidx = atm.GetIdx()
pos = oldconf.GetAtomPosition(atomidx)
newconf.SetAtomPosition(atomidx, pos)
for bnd in mol.GetBonds():
newmol.AddBond(bnd.GetBeginAtomIdx(), bnd.GetEndAtomIdx(), Chem.BondType(bnd.GetBondType()))
newmol.AddConformer(newconf)
Chem.SanitizeMol(newmol)
Chem.DetectBondStereoChemistry(newmol, newmol.GetConformer())
# these aren't necessary for this specific test case, but are for
# a more general conversion routine, so would like to see them
# tested eventually
# Chem.AssignAtomChiralTagsFromStructure(newmol)
# Chem.AssignStereochemistry(newmol)
self.assertEqual(Chem.MolToSmiles(newmol, isomericSmiles=True), refSmiles)
def CHToN(m, cn_idx, subst=None):
"""
arguments: mol object, connection atom index, substituent (optional and not necessary for this function,
but when called from Modifications2 it requires subst as an argument)
returns: new mol object
this function replaces an aromatic atom with index cn_idx with a N atom bound to a substituent
"""
print('chose CHtoN')
mw = Chem.RWMol(m)
Chem.Kekulize(mw, clearAromaticFlags=True)
#the ring the atom is a part of
for ring in mw.GetRingInfo().AtomRings():
if cn_idx in ring:
target_ring = ring #ring containing the connection atom
#remove the ngbs that are not part of the ring
for ngb in mw.GetAtomWithIdx(cn_idx).GetNeighbors():
if ngb.GetIdx() not in target_ring:
mw.RemoveAtom(ngb.GetIdx())
#replace C with N
mw.ReplaceAtom(cn_idx, Chem.Atom(7))
# mw.GetAtomWithIdx(cn_idx).SetFormalCharge(1)
# h=mw.AddAtom(Chem.Atom(1))
# mw.AddBond(h,cn_idx,Chem.BondType.SINGLE)
# Chem.SanitizeMol(mw)
return mw