void CleanupMolecule() {
// an example of doing some cleaning up of a molecule before
// calling the sanitizeMol function()
// build: C1CC1C(:O):O
RWMol *mol = new RWMol();
// add atoms and bonds:
mol->addAtom(new Atom(6)); // atom 0
mol->addAtom(new Atom(6)); // atom 1
mol->addAtom(new Atom(6)); // atom 2
mol->addAtom(new Atom(6)); // atom 3
mol->addAtom(new Atom(8)); // atom 4
mol->addAtom(new Atom(8)); // atom 5
mol->addBond(3, 4, Bond::AROMATIC); // bond 0
mol->addBond(3, 5, Bond::AROMATIC); // bond 1
mol->addBond(3, 2, Bond::SINGLE); // bond 2
mol->addBond(2, 1, Bond::SINGLE); // bond 3
mol->addBond(1, 0, Bond::SINGLE); // bond 4
mol->addBond(0, 2, Bond::SINGLE); // bond 5
// instead of calling sanitize mol, which would generate an error,
// we'll perceive the rings, then take care of aromatic bonds
// that aren't in a ring, then sanitize:
MolOps::findSSSR(*mol);
for (ROMol::BondIterator bondIt = mol->beginBonds();
bondIt != mol->endBonds(); ++bondIt) {
if (((*bondIt)->getIsAromatic() ||
(*bondIt)->getBondType() == Bond::AROMATIC) &&
!mol->getRingInfo()->numBondRings((*bondIt)->getIdx())) {
// remove the aromatic flag on the bond:
(*bondIt)->setIsAromatic(false);
// and cleanup its attached atoms as well (they were
// also marked aromatic when the bond was added)
(*bondIt)->getBeginAtom()->setIsAromatic(false);
(*bondIt)->getEndAtom()->setIsAromatic(false);
// NOTE: this isn't really reasonable:
(*bondIt)->setBondType(Bond::SINGLE);
}
}
// now it's safe to sanitize:
RDKit::MolOps::sanitizeMol(*mol);
// Get the canonical SMILES, include stereochemistry:
std::string smiles;
smiles = MolToSmiles(*(static_cast<ROMol *>(mol)), true);
BOOST_LOG(rdInfoLog) << " fixed SMILES: " << smiles << std::endl;
}
int setAromaticity(RWMol &mol) {
// FIX: we will assume for now that if the input molecule came
// with aromaticity information it is correct and we will not
// touch it. Loop through the atoms and check if any atom has
// arom stuff set. We may want check this more carefully later
// and start from scratch if necessary
ROMol::AtomIterator ai;
for (ai = mol.beginAtoms(); ai != mol.endAtoms(); ai++) {
if ((*ai)->getIsAromatic()) {
// found aromatic info
return -1;
}
}
// first find the all the simple rings in the molecule
VECT_INT_VECT srings;
if (mol.getRingInfo()->isInitialized()) {
srings = mol.getRingInfo()->atomRings();
} else {
MolOps::symmetrizeSSSR(mol, srings);
}
int narom = 0;
// loop over all the atoms in the rings that can be candidates
// for aromaticity
// Atoms are candidates if
// - it is part of ring
// - has one or more electron to donate or has empty p-orbitals
int natoms = mol.getNumAtoms();
boost::dynamic_bitset<> acands(natoms);
boost::dynamic_bitset<> aseen(natoms);
VECT_EDON_TYPE edon(natoms);
VECT_INT_VECT cRings; // holder for rings that are candidates for aromaticity
for (VECT_INT_VECT_I vivi = srings.begin(); vivi != srings.end(); ++vivi) {
bool allAromatic = true;
for (INT_VECT_I ivi = (*vivi).begin(); ivi != (*vivi).end(); ++ivi) {
if (aseen[*ivi]) {
if (!acands[*ivi]) allAromatic = false;
continue;
}
aseen[*ivi] = 1;
Atom *at = mol.getAtomWithIdx(*ivi);
// now that the atom is part of ring check if it can donate
// electron or has empty orbitals. Record the donor type
// information in 'edon' - we will need it when we get to
// the Huckel rule later
edon[*ivi] = getAtomDonorTypeArom(at);
acands[*ivi] = isAtomCandForArom(at, edon[*ivi]);
if (!acands[*ivi]) allAromatic = false;
}
if (allAromatic) {
cRings.push_back((*vivi));
}
}
// first convert all rings to bonds ids
VECT_INT_VECT brings;
RingUtils::convertToBonds(cRings, brings, mol);
// make the neighbor map for the rings
// i.e. a ring is a neighbor a another candidate ring if
// shares at least one bond
// useful to figure out fused systems
INT_INT_VECT_MAP neighMap;
RingUtils::makeRingNeighborMap(brings, neighMap, maxFusedAromaticRingSize);
// now loop over all the candidate rings and check the
// huckel rule - of course paying attention to fused systems.
INT_VECT doneRs;
int curr = 0;
int cnrs = rdcast<int>(cRings.size());
boost::dynamic_bitset<> fusDone(cnrs);
INT_VECT fused;
while (curr < cnrs) {
fused.resize(0);
RingUtils::pickFusedRings(curr, neighMap, fused, fusDone);
applyHuckelToFused(mol, cRings, brings, fused, edon, neighMap, narom, 6);
int rix;
for (rix = 0; rix < cnrs; rix++) {
if (!fusDone[rix]) {
curr = rix;
break;
}
}
if (rix == cnrs) {
break;
}
}
mol.setProp(common_properties::numArom, narom, true);
return narom;
}
