Method for treating cardiovascular disease with calcium channel antagonists

摘要

Compounds of the formula <IMAGE> (1) wherein R1 and R2 are each independently -H or lower alkoxy; R3 and R4 are each independently lower alkyl; and R5 and R6 are each -OCH3, or together form -OCH2O- or -OCH2CH2O- and pharmaceutically acceptable acid addition salts thereof are calcium channel blockers useful for treating cardiovascular disorders including angina, hypertension and congestive heart failure.