1H-benz[4',5']indeno[1',7a':2,3]cyclobuta[1,2-b]furan-4-carboxylic acid, 2,3,4,4a,5,6,7,7a,11,12,12a,12b-dodecahydro-4,12b-dimethyl-, methyl ester, (4S,4aR,6aS,7aR,10aS,12aR,12bR)- InChI=1/C21H30O3/c1-18-7-4-8-19(2,17(22)23-3)14(18)5-10-21-13-16-20(21,11-12-24-16)9-6-15(18)21/h11-12,14-16H,4-10,13H2,1-3H3/t14-,15-,16-,18+,19+,20-,21+/m1/s methyl rel-(4R,4aS,6aR,7aS,10aR,12aS,12bS)-4,12b-dimethyl-2,3,4,4a,5,6,7,7a,11,12,12a,12b-dodecahydro-1H-benzo[4',5']indeno[1',7a':2,3]cyclobuta[1,2-b]furan-4-carboxylate