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 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 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 _prevent_allene(self, mol: Chem.Mol) -> Chem.Mol:
if not isinstance(mol, Chem.RWMol):
mol = Chem.RWMol(mol)
for atom in mol.GetAtoms():
if atom.GetAtomicNum() < 14:
n = []
for bond in atom.GetBonds():
if bond.GetBondType().name in ('DOUBLE', 'TRIPLE'):
n.append(bond)
else:
pass
if len(n) > 2:
#this is a mess!
log.info(f'Allene issue: {n} double bonds on {atom.GetSymbol()} atom {atom.GetIdx()}!')
for bond in n:
bond.SetBondType(Chem.BondType().SINGLE)
elif len(n) == 2:
# downgrade the higher bonded one!
others = [a for bond in n for a in (bond.GetBeginAtom(), bond.GetEndAtom()) if a.GetIdx() != atom.GetIdx()]
others = sorted(others, key=lambda atom: sum([b.GetBondTypeAsDouble() for b in atom.GetBonds()]))
log.info(f'Allene removed between {atom.GetIdx()} and {[a.GetIdx() for a in others]}')
mol.GetBondBetweenAtoms(atom.GetIdx(), others[-1].GetIdx()).SetBondType(Chem.BondType.SINGLE)
else:
pass
else:
continue
return mol
def to_rdmol(plams_mol, sanitize=True):
"""
Translate a PLAMS molecule into an RDKit molecule type.
:parameter plams_mol: PLAMS molecule
:type plams_mol: plams.Molecule
:return: an RDKit molecule
:rtype: rdkit.Chem.Mol
"""
if isinstance(plams_mol, Chem.Mol):
return plams_mol
# Create rdkit molecule
e = Chem.EditableMol(Chem.Mol())
for atom in plams_mol.atoms:
a = Chem.Atom(atom.atnum)
if 'charge' in atom.properties:
a.SetFormalCharge(atom.properties.charge)
if 'pdb_info' in atom.properties:
set_PDBresidueInfo(a, atom.properties.pdb_info)
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 getbondtype(self,bondtype):
if bondtype.GetBondType().__str__() == 'SINGLE':
return Chem.BondType().DOUBLE
elif bondtype.GetBondType().__str__() == 'DOUBLE':
return Chem.BondType().TRIPLE
elif bondtype.GetBondType().__str__() == 'TRIPLE':
return Chem.BondType().QUADRUPLE
elif bondtype.GetBondType().__str__() == 'QUADRUPLE':
return Chem.BondType().QUINTUPLE
elif bondtype.GetBondType().__str__() == 'QUINTUPLE':
raise ReactionQueryError('BondIncrease: Increasing bond order above quintuple bond is not supported')
elif bondtype.GetBondType().__str__() == 'AROMATIC':
raise ReactionQueryError('BondIncrease: Increasing bond order of aromatic bond is not supported')
elif bondtype.GetBondType().__str__() == 'DATIVE':
raise ReactionQueryError('BondIncrease: Increasing bond order of partial bond is not supported')
else:
raise ReactionQueryError("BondDecrease: Unsupported bond type:'"+bondtype.GetBondType().__str__()+"'")
def convertSMILES(self, atoms, bonds):
"""Convert atoms and bonds information to SMILES."""
m = Chem.RWMol(Chem.MolFromSmiles(''))
d = {}
for name, number in zip(self.atomnames[atoms], atoms):
d[number] = m.AddAtom(Chem.Atom(name))
for atom1, atom2, level in bonds:
m.AddBond(d[atom1], d[atom2], Chem.BondType(level))
name = Chem.MolToSmiles(m)
return name
def to_rdmol(plams_mol, sanitize=True, properties=True):
"""
Translate a PLAMS molecule into an RDKit molecule type.
PLAMS |Molecule|, |Atom| or |Bond| properties are pickled if they are neither booleans, floats,
integers, floats nor strings, the resulting property names are appended with '_pickled'.
:parameter plams_mol: A PLAMS molecule
:parameter bool sanitize: Kekulize, check valencies, set aromaticity, conjugation and hybridization
:parameter bool properties: If all |Molecule|, |Atom| and |Bond| properties should be converted from PLAMS to RDKit format.
:type plams_mol: |Molecule|
:return: an RDKit molecule
:rtype: rdkit.Chem.Mol
"""
if isinstance(plams_mol, Chem.Mol):
return plams_mol
# Create rdkit molecule
e = Chem.EditableMol(Chem.Mol())
for atom in plams_mol.atoms:
a = Chem.Atom(atom.atnum)
if 'charge' in atom.properties:
a.SetFormalCharge(atom.properties.charge)
if properties:
if 'pdb_info' in atom.properties:
set_PDBresidueInfo(a, atom.properties.pdb_info)
for prop in atom.properties:
if prop != 'charge' or prop != 'pdb_info':
prop_to_rdmol(atom, a, prop)
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 properties:
for pl_bond, rd_bond in zip(plams_mol.bonds, rdmol.GetBonds()):
for prop in pl_bond.properties:
prop_to_rdmol(pl_bond, rd_bond, prop)
for prop in plams_mol.properties:
prop_to_rdmol(plams_mol, rdmol, prop)
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 to_rdmol(plams_mol, sanitize=True, properties=True, assignChirality=False):
"""
Translate a PLAMS molecule into an RDKit molecule type.
PLAMS |Molecule|, |Atom| or |Bond| properties are pickled if they are neither booleans, floats,
integers, floats nor strings, the resulting property names are appended with '_pickled'.
:parameter plams_mol: A PLAMS molecule
:parameter bool sanitize: Kekulize, check valencies, set aromaticity, conjugation and hybridization
:parameter bool properties: If all |Molecule|, |Atom| and |Bond| properties should be converted from PLAMS to RDKit format.
:parameter bool assignChirality: Assign R/S and cis/trans information, insofar as this was not yet present in the PLAMS molecule.
:type plams_mol: |Molecule|
:return: an RDKit molecule
:rtype: rdkit.Chem.Mol
"""
if isinstance(plams_mol, Chem.Mol):
return plams_mol
# Create rdkit molecule
e = Chem.EditableMol(Chem.Mol())
# Add atoms and assign properties to the RDKit atom if *properties* = True
for pl_atom in plams_mol.atoms:
rd_atom = Chem.Atom(pl_atom.atnum)
if 'charge' in pl_atom.properties:
rd_atom.SetFormalCharge(pl_atom.properties.charge)
if properties:
if 'pdb_info' in pl_atom.properties:
set_PDBresidueInfo(rd_atom, pl_atom.properties.pdb_info)
for prop in pl_atom.properties:
if prop not in ('charge', 'pdb_info', 'stereo'):
prop_to_rdmol(pl_atom, rd_atom, prop)
# Check for R/S information
if pl_atom.properties.stereo:
stereo = pl_atom.properties.stereo.lower()
if stereo == 'counter-clockwise':
rd_atom.SetChiralTag(
Chem.rdchem.ChiralType.CHI_TETRAHEDRAL_CCW)
elif stereo == 'clockwise':
rd_atom.SetChiralTag(Chem.rdchem.ChiralType.CHI_TETRAHEDRAL_CW)
e.AddAtom(rd_atom)
# Mapping of PLAMS bond orders to RDKit bond types:
def plams_to_rd_bonds(bo):
if bo > 1.4 and bo < 1.6:
return 12 # bond type for aromatic bond
else:
return int(bo)
# Add bonds to the RDKit molecule
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(plams_to_rd_bonds(bond.order)))
rdmol = e.GetMol()
# Check for cis/trans information
for pl_bond, rd_bond in zip(plams_mol.bonds, rdmol.GetBonds()):
if pl_bond.properties.stereo:
stereo = pl_bond.properties.stereo.lower()
if stereo == 'e' or stereo == 'trans':
rd_bond.SetStereo(Chem.rdchem.BondStereo.STEREOE)
elif stereo == 'z' or stereo == 'cis':
rd_bond.SetStereo(Chem.rdchem.BondStereo.STEREOZ)
elif stereo == 'up':
rd_bond.SetBondDir(Chem.rdchem.BondDir.ENDUPRIGHT)
elif stereo == 'down':
rd_bond.SetBondDir(Chem.rdchem.BondDir.ENDDOWNRIGHT)
# Assign properties to RDKit molecule and bonds if *properties* = True
if properties:
for prop in plams_mol.properties:
prop_to_rdmol(plams_mol, rdmol, prop)
for pl_bond, rd_bond in zip(plams_mol.bonds, rdmol.GetBonds()):
for prop in pl_bond.properties:
if prop != 'stereo':
prop_to_rdmol(pl_bond, rd_bond, prop)
if sanitize:
Chem.SanitizeMol(rdmol)
conf = Chem.Conformer()
for i, atom in enumerate(plams_mol.atoms):
xyz = Geometry.Point3D(atom._getx(), atom._gety(), atom._getz())
conf.SetAtomPosition(i, xyz)
rdmol.AddConformer(conf)
# REB: Assign all stereochemistry, if it wasn't already there
if assignChirality:
Chem.rdmolops.AssignAtomChiralTagsFromStructure(
rdmol, confId=conf.GetId(), replaceExistingTags=False)
try:
Chem.AssignStereochemistryFrom3D(rdmol,
confId=conf.GetId(),
replaceExistingTags=False)
except AttributeError:
pass
return rdmol
