Sankyo Company, Limited

Kuniyuki Tomita

Hiroyuki Koike

Yasuhiro Morisawa

Shinsaku Kobayashi

Yasuo Shimoji

Nobuyoshi Iwata

Yasunobu Sato

Seiji Kumakura

Fused ring compounds of formula (I): ##STR1## (where R.sup.1 -R.sup.4, X.sup.1 and X.sup.2 represent hydrogen or various substituents, n and m are 1-3 and 2-7 respectively, the dotted lines are double or single bonds and Y is one oxygen or two hydrogens) have magnificent anti-arrhythmic activity, diuretic activity and the ability to improve brain function.

Fused 5 ring heterocyclic compounds, their preparation, and their

Benzothiazocine and benzothiazonine derivatives of formula (I): ##STR1## in which: R.sup.1, R.sup.2 and R.sup.3 are the same or different and each represents a hydrogen atom or an alkyl group;

Benzothiazocine and benzothiazonine derivatives and use

Growing community of inventors

Hiromachi, Japan

Kuniyuki Tomita