the inhibitory effects of the catecholamine and clonidine were blocked by phentolamine ( 2.7 x 10 ( -6 ) m ) but not by 5- ( 3-tert-butylamino-2-hydroxy ) -propoxy-3 , 4-dihydrocarbostyril hydrochloride ( opc 1085 ) which blocked the effect of isoproterenol .
C0007412
catecholamine
C0022245
isoproterenol