SEARCH Articles Figures Tables Five-membered heterocycles with O and N atoms Five-membered ring systems with O and N atoms Heterocyclics (s. a. Ring with 1 O-atom O atom reaction with Reaction of O atoms with Reaction of O atoms with cyanides Reactions of O atoms with nitrogen compounds With O N Atoms With O S (Se, Te) Atoms With O and N atoms With O and S (Se, Te) atoms With O andor S atoms