in isolated electrically driven ( 1 hz ) left atria of guinea pigs , ( s ) -emopamil inhibited contractile force at a much higher concentration ( ec50 = 29 mumol/l ) than verapamil and gallopamil ( ec50 = 1.1 and 0.19 mumol/l , respectively ) .
C0042523
verapamil
C0016986
gallopamil