Compounds represented by formula (I):
wherein, for example, R₁, R₂, R₃, and R₄ each represents a hydrogen atom; R₆ and R₇ each represent a substituted or unsubstituted lower alkyl group; A represents a group represented by formula (II):
wherein R₅ represents, for example, a hydrogen atom; and n represents an integer of 2 to 6, or a possible stereoisomer or optical isomer thereof and a pharmaceutically acceptable salt thereof. The compounds represented by formula (I) have an inhibitory action on calcium overload in addition to a vasorelaxing activity (calcium antagonism) and an inhibitory action on lipid peroxidation and are useful as a preventive or treating agent for ischemic diseases and a hypertension.
A compound represented by general formula (I), possible stereoisomer and optical isomer thereof, and pharmaceutically acceptable salts thereof, wherein R1, R2, R3 and R4 represent each hydrogen, etc.; R6 and R7 represent each optionally substituted lower alkyl; A represents a group of general formula (II) (wherein R5 represents hydrogen, etc.); and n is an integer of from 2 to 6. These compounds can suppress the formation of active oxygen and an increase in intracellular calcium and thus are useful as a remedy for ischemic diseases.