(1R,2S,3S,4R,4aS,8aS)-4-((benzyloxy)methyl)-2-((tert-butyldimethylsilyl)oxy)-3,4-dimethyloctahydronaphthalene-1,8a(1H)-diol

diethyl (3aR,4S,9R,9aS,13aS,14S)-2,2,9,14-tetramethyl-8-oxo-3a,4,9,9a,10,11,12,13-octahydro-8H-4,9-methanobenzo[d][1,3]dioxolo[4,5-c]oxonine-6,7-dicarboxylate

(E)-2-((3aR,4S,5S,6R,6aS,10aS)-6-Hydroxymethyl-2,2,5,6-tetramethyl-octahydro-naphtho[1,8a-d][1,3]dioxol-4-yloxy)-but-2-enedioic acid diethyl ester

(E)-2-((3aR,4S,5S,6R,6aS,10aS)-6-Benzyloxymethyl-2,2,5,6-tetramethyl-octahydro-naphtho[1,8a-d][1,3]dioxol-4-yloxy)-but-2-enedioic acid diethyl ester