Synonyms: Euphorbia factor C;53783-82-7;2-Butenoic acid, 2-methyl-, (1S,1aR,1bS,4aR,7aS,7bR,8R,9aS)-1,1a,1b,4,4a,5,7a,7b,8,9-decahydro-4a,7b-dihydroxy-3-(hydroxymethyl)-1,6,8-trimethyl-1-((2-methyl-1-oxopropoxy)methyl)-5-oxo-9aH-cyclopropa(3,4)benz(1,2-e)azulen-9a-yl ester, (2Z)-;2-Butenoic acid, 2-methyl-, 1,1a,1b,4,4a,5,7a,7b,8,9-decahydro-4a,7b-dihydroxy-3-(hydroxymethyl)-1,6,8-trimethyl-1-((2-methyl-1-oxopropoxy)methyl)-5-oxo-9aH-cyclopropa(3,4)benz(1,2-e)azulen-9a-yl ester, (1S-(1alpha,1aalpha,1bbeta,4abeta,7aalpha,7balpha,8alpha,9aalpha(Z)))-;52691-09-5