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