(4aS,6aS,11aR,11bS)-7,10-dimethoxy-8-(methoxymethyl)-4,4,6a,11b-tetramethyl-2,3,4,4a,5,6,6a,11,11a,11b-decahydro-1H-benzo[a]fluorene

(1R,4aR,5S,6S,8aR)-methyl 6-formyl-1,4a-dimethyl-5-(2-(2-methyl-1,3-dioxolan-2-yl))-decahydronaphthalene-1-carboxylate