27536-56-7 4-alpha-Phorbol 12,13-didecanoate 4-alpha-Phorbol-12,13-didecanoate 4a-Phorbol-12,13-didecanoate 4alpha-Phorbol 12,13-didecanoate 4alpha-Phorbol 12,13-dideconate Decanoic acid, 1,1a,1b,4,4a,5,7a,7b,8,9-decahydro-4a,7b-dihydroxy-3-(hydroxymethyl)-1,1,6,8-tetramethyl-5-oxo-9aH-cyclopropa(3,4)benz(1,2-e)azulene-9,9a-diyl ester, (1aR-(1aalpha,1bbeta,4aalpha,7aalpha,7balpha,8alpha,9beta,9aalpha))-