def remove_bridge(molecule: Mol, root_pattern_smiles: str,
removal_indices: List[int]) -> Optional[Mol]:
root_pattern = Chem.MolFromSmiles(root_pattern_smiles)
matches = molecule.GetSubstructMatches(root_pattern)
if len(matches) == 0:
return None
match = matches[0]
e_mol = Chem.EditableMol(molecule)
indexes_to_delete = list(map(lambda i: match[i], removal_indices))
indexes_to_delete.sort(reverse=True)
for i in indexes_to_delete:
e_mol.RemoveAtom(i)
molecule = e_mol.GetMol()
return get_largest_fragment(molecule)
def construct_mol_features(mol: rdchem.Mol,
out_size: Optional[int] = -1) -> np.ndarray:
"""Returns the atom features of all the atoms in the molecule.
Params:
-------
mol: rdkit.Chem.rdchem.Mol
Molecule of interest.
out_size: int, optional, default=-1
The size of the returned array. If this option is negative, it
does not take any effect. Otherwise, it must be larger than or
equal to the number of atoms in the input molecule. If so, the
end of the array is padded with zeros.
Returns:
--------
mol_feats: np.ndarray, shape=(n,m)
Where `n` is the total number of atoms within the molecule, and
`m` is the number of feats.
"""
# Caluclate charges and chirality of atoms within molecule
rdPartialCharges.ComputeGasteigerCharges(
mol) # stored under _GasteigerCharge
rdmolops.AssignStereochemistry(
mol) # stored under _CIPCode, see doc for more info
# Retrieve atom index locations of matches
HYDROGEN_DONOR = rdmolfiles.MolFromSmarts(
"[$([N;!H0;v3,v4&+1]),$([O,S;H1;+0])" + ",n&H1&+0]")
HYROGEN_ACCEPTOR = rdmolfiles.MolFromSmarts(
"[$([O,S;H1;v2;!$(*-*=[O,N,P,S])])" +
",$([O,S;H0;v2]),$([O,S;-]),$([N;v3;!$(N-*=[O,N,P,S])]),n&H0&+0," +
"$([o,s;+0;!$([o,s]:n);!$([o,s]:c:n)])]")
ACIDIC = rdmolfiles.MolFromSmarts("[$([C,S](=[O,S,P])-[O;H1,-1])]")
BASIC = rdmolfiles.MolFromSmarts(
"[#7;+,$([N;H2&+0][$([C,a]);!$([C,a](=O))])" +
",$([N;H1&+0]([$([C,a]);!$([C,a](=O))])[$([C,a]);!$([C,a](=O))])," +
"$([N;H0&+0]([C;!$(C(=O))])([C;!$(C(=O))])[C;!$(C(=O))])]")
hydrogen_donor_match = sum(mol.GetSubstructMatches(HYDROGEN_DONOR), ())
hydrogen_acceptor_match = sum(mol.GetSubstructMatches(HYROGEN_ACCEPTOR),
())
acidic_match = sum(mol.GetSubstructMatches(ACIDIC), ())
basic_match = sum(mol.GetSubstructMatches(BASIC), ())
# Get ring info
ring = mol.GetRingInfo()
mol_feats = []
n_atoms = mol.GetNumAtoms()
for atom_idx in range(n_atoms):
atom = mol.GetAtomWithIdx(atom_idx)
atom_feats = []
atom_feats += one_hot(atom.GetSymbol(), [
'C', 'O', 'N', 'S', 'Cl', 'F', 'Br', 'P', 'I', 'Si', 'B', 'Na',
'Sn', 'Se', 'other'
])
atom_feats += one_hot(atom.GetDegree(), [1, 2, 3, 4, 5, 6])
atom_feats += one_hot(atom.GetHybridization(),
list(rdchem.HybridizationType.names.values()))
atom_feats += one_hot(atom.GetImplicitValence(), [0, 1, 2, 3, 4, 5, 6])
atom_feats += one_hot(atom.GetFormalCharge(), [-3, -2, -1, 0, 1, 2, 3])
g_charge = float(atom.GetProp("_GasteigerCharge"))
atom_feats += [g_charge] if not np.isnan(g_charge) else [0.]
atom_feats += [atom.GetIsAromatic()]
atom_feats += [
ring.IsAtomInRingOfSize(atom_idx, size) for size in range(3, 9)
]
atom_feats += one_hot(atom.GetTotalNumHs(), [0, 1, 2, 3, 4])
# Chirality
try:
atom_feats += one_hot(atom.GetProp('_CIPCode'), ["R", "S"]) + [
atom.HasProp("_ChiralityPossible")
]
except:
atom_feats += [False, False] + [atom.HasProp("_ChiralityPossible")]
# Hydrogen bonding
atom_feats += [atom_idx in hydrogen_donor_match]
atom_feats += [atom_idx in hydrogen_acceptor_match]
# Is Acidic/Basic
atom_feats += [atom_idx in acidic_match]
atom_feats += [atom_idx in basic_match]
mol_feats.append(atom_feats)
if out_size < 0:
return np.array(mol_feats, dtype=np.float)
elif out_size >= n_atoms:
# 'empty' padding for `mol_feats`. Generate(s) feature matrix of same size for all mols
# NOTE: len(mol_feats[0]) is the number of feats
padded_mol_feats = np.zeros((out_size, len(mol_feats[0])),
dtype=np.float)
padded_mol_feats[:n_atoms] = np.array(mol_feats, dtype=np.float)
return padded_mol_feats
else:
raise ValueError(
'`out_size` (N={}) must be negative or larger than or '
'equal to the number of atoms in the input molecules (N={}).'.
format(out_size, n_atoms))