2H-Cyclopenta(b)naphtho(2,3-d)furan-10-carboxylic acid,5-(acetyloxy)-2-(3-furanyl)-3,3a,4a,5,5a,8,9,9a,10,10a-decahydro-1,6,9a,10a-tetramethyl-9-oxo-, methyl ester, (2R,3aS,4aS,5R,5aS,9aR,10S,10aR)- 78916-54-8