unsigned int OEDetermineAromaticRingSystems(const OEMolBase &mol, unsigned int *rings)
Determines the aromatic ring systems of a molecule. The return
value is the number of aromatic ring systems found in the molecule.
If the molecule is acyclic or there is no aromatic ring system in
the molecule, the return value is zero. The ‘rings’ array must
contain at least
elements, and upon return it contains a mapping indexed by
OEAtomBase.GetIdx of which aromatic ring system
each atom is in. The aromatic ring systems are numbered from one,
up to an including the return value of the function. Atoms that
aren’t contained in an aromatic ring, i.e. for which
mapped to the value zero.
It is necessary to call
OEAssignAromaticFlags functions prior to calling
Ring Systems Identification section