2-(4-ALKOXYPHENYL)-5 (2-AMINOETHYL)-4-OXO- 3-NAPHTHO- (2, 1B) -1,4-THIAZEPINONE DERIVATIVES, THEIR PREPARATION AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM

摘要

A novel naphthpthiazepine derivative of the formula: wherein R<1> is a lower alkoxy group, R<2> is hydrogen atom or a lower alkanoyl group, and R<3> and R<4> are the same or different and hydrogen atom or a lower alkyl group, or a pharmaceutically acceptable acid addition salt thereof, are disclosed. Said derivative (I) and a salt thereof are useful as hypotensive agents and/or coronary or cerebral vasodilators.