This namespace contains constants.
The combination of the following flags.
OESmartsParseOpts_Optimize option is
turned on, the atom and bond expressions are optimized for
Additional ring constraint is added to each ring atom of the
OEQMolBase query molecule.
This can significantly increase the performance of the substructure
For example, matching the
C1CCCCC1 ring against the
will fail much faster, since none of the query ring atoms can be mapped to
any of the target chain atom.