half-maximally effective concentrations , ec50 , for the positive inotropic effect of 8-substituted cyclic amp ( sodium salt ) increased in the order 8- ( 4-chloro-phenyl ) thio-cyclic amp , 8-tertiary-butyl-thio-cyclic amp , 8-benzyl-seleno-cyclic amp , 8-benzyl-thio-cyclic amp , 8-methyl-thio-cyclic amp , 8-bromo-cyclic amp .
C0001455
cyclic amp
C0000661
8-bromo-cyclic amp