The early French work in the phenothiazine field, following the lead of chloropromazine, resulted in the synthesis of the 2-methyl and 2-methoxy derivative^.^ Further work in France5 and in Switzerland, 6 as well as independent work in our laboratories, produced the 2-methylmercapto-and 2-methylsulfonyl-phenothiazines. The development of the potent l0- aminoalkyl-2-trifluoromethylphe-