with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, attached to ring carbon atoms

Full Title

Heterocyclic compounds containing rings having one nitrogen atom as the only ring hetero atom, according to more than one of groups C07D203/00 - C07D225/00 > with only hydrogen or carbon atoms directly attached to the ring nitrogen atom > with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, attached to ring carbon atoms