Synonyms: Propanoicacid, 2-methyl-,1,5,8a,9-tetrakis(acetyloxy)tetradecahydro-1,7,10-trimethyl-4-oxo-6-(1-oxopropoxy)-1H-10,4a-(epoxymethano)cyclobuta[3,4]benz[1,2-f]azulen-3-ylester, [1S-(1a,2ab,3a,4ab,5b,5ab,6a,7a,8aa,9a,10b,10aa,10bb)]-; Euphorbia substance SPr 4