carbachol-induced ip1 accumulation in these cells was potently and noncompetitively inhibited by the biologically active phorbol esters , phorbol dibutyrate ( pdb ) and phorbol myristate diacetate ( pma ) , while the biologically inactive phorbol , 4 beta-phorbol , failed to affect this phosphoinositide breakdown .
C0031586
phorbol esters
C0039654
pma