This namespace contains constants that are used with
OEMolBuilderOptions::SetEnumNitrogen to control the
behavior of OEOmega with respect to enumeration
of nonterminal nitrogens. Any nitrogen with pyramidal geometry in
the initial model of the input molecule, and having no more than
two ring bonds is considered by OEOmega to be
Nitrogens are not enumerated.
All invertible nitrogens will be enumerated.
Only invertible nitrogens with unspecified stereochemistry will be enumerated.