Synonyms: Octanoic 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-(1aa,1bb,4ab,7aa,7ba,8a,9b,9aa)]-; 9aH-Cyclopropa[3,4]benz[1,2-e]azulene, octanoic acid deriv.; Phorbol 12,13-dioctanoate