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