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