Synonyms: Butanoicacid, 3-methyl-,decahydro-4,4a-dihydroxy-3,5-bis(methylene)-2-oxospiro[azuleno[6,5-b]furan-8(2H),2'-oxiran]-6-ylester, [3aS-(3aa,4a,4aa,6a,7aa,8a,9ab)]-; Spiro[azuleno[6,5-b]furan-8(2H),2'-oxirane], butanoic acid deriv.;Venidiolide A