thiazole

A colorless or pale yellow aromatic liquid, C₃H₃NS, containing a ring composed of a nitrogen atom, a sulfur atom, and three carbon atoms, used in making dyes and fungicides.

Any of various derivatives of this compound.

Any of a class of unsaturated heterocyclic compounds containing a ring of three carbon atoms, a sulphur and an nitrogen atom; especially the simplest one, C3H3SN.