Phenothiazine

Phenothiazine is an organic compound that occurs in various antipsychotic and antihistaminic drugs. It has the formula S(C₆H₄)₂NH. This yellow tricyclic compound is soluble in acetic acid, benzene, and ether. The compound is related to the thiazine-class of heterocyclic compounds. Derivatives of the parent compound find wide use as drugs.