Synonyms: (1R,3aR,4aR,8aR,9S,9aR)-1-methyl-3-oxodecahydro-3H-spiro[naphtho[2,3-c]furan-6,2'-[1,3]dioxolane]-9-carboxylic acid;Naphtho[2,3-c]furan-4-carboeylic acid,7-[(ehoxycarbonyl)amino]dodecahydro-3-methyl-1-oxo-(3R、3aR、4S、4aR、7R、8aR、9aR)-;(3R,3aR,4S,4aR,7R,8aR,9aR)-7-((Ethoxycarbonyl)amino)-3-methyl-1-oxododecahydronaphtho[2,3-c]furan-4-carboxylic acid