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Methyl [(2R,3aR,4aS,5R,5aS,9aR,10S,10aR)-2-(3-furyl)-5-hydroxy-1,6,9a,10a-tetramethyl-9-oxo-3,3a,4a,5,5a,8,9,9a,10,10a-decahydro-2H-cyclopenta[b]naphtho[2,3-d]furan-10-yl]acetate, 2H-Cyclopenta[b]naphtho[2,3-d]furan-10-acetic acid, 2-(3-furanyl)-3,3a,4a,5,5a,8,9,9a,10,10a-decahydro-5-hydroxy-1,6,9a,10a-tetramethyl-9-oxo-, methyl ester, (2R,3aR,4aS,5R,5aS,9aR,10S,10aR)-