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