12-Deoxyphorbol 13-isobutyrate 5H-Cyclopropa[3,4]benz[1,2-e]azulen-5-one, 1,1a.alpha.,1b.beta.,4,4a,7a.alpha.,7b,8,9,9a-decahydro-4a.beta.,7b.alpha.,9a.alpha.-trihydroxy-3-(hydroxymethyl)-1,1,6,8.alpha.-tetramethyl-, 9a-isobutyrate NSC632857 Propanoic acid, 2-methyl-, (1aR,1bS,4aR,7aS,7bR,8R,9aS)-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]azulen-9a-yl ester