Oxygen atoms

Full Title

Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members > having three double bonds between ring members or between ring members and non-ring members > having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom > with substituted hydrocarbon radicals attached to ring carbon atoms > Radicals substituted by singly-bound oxygen or sulphur atoms > Oxygen atoms