Definition: Five-membered heterocyclic ring structures containing an oxygen in the 1-position and a nitrogen in the 3-position, in distinction from ISOXAZOLES where they are at the 1,2 positions.
includes oxazolines, oxazolidines
Other names 1,3 Oxazolium 5 Oxides; Munchnones; 1,3-Oxazolium-5-Oxides