FUSED-RING HETEROCYCLIC COMPOUNDS A PROCESS FOR THEIR PRODUCTION AND THEIR PHARMACEUTICAL USE

摘要

Fused ring compounds of formula (I): (I) (where R1-R4, X1 and X2 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.