Synonyms: Butanoicacid, 2-methyl-,2-[8a-[(acetyloxy)methyl]octahydro-4,8-dihydroxy-5,6-dimethylspiro[naphthalene-1(2H),2'-oxiran]-5-yl]-1-(2,5-dihydro-5-oxo-3-furanyl)ethylester, [1R-[1a,4b,4ab,5b[S*(S*)],6a,8a,8aa]]-; Spiro[naphthalene-1(2H),2'-oxirane], butanoicacid deriv.; Ajugamarin E 2