phorbol esters , which like diacylglycerols are well-known activators of protein kinase c ( the ca2+- and phospholipid-dependent enzyme ) , inhibit 70 % of ca2+ channel activity ( k0.5 = 25 nm for phorbol 12-myristate 13-acetate and k0.5 = 200 nm for phorbol 12,13-dibutyrate ) .
C0031586
phorbol esters
C0039654
phorbol