(4S,4aS,6R,9S,11S,12S,12aR)-11,12-(Carbonyldioxy)-4a,8,13,13-tetramethyl-1-methylene-5-oxo-4,9-bis(triethylsiloxy)-1,2,3,4,4a,5,6,9,10,11,12,12a-dodecahydro-7,11-methanobenzocyclodecen-6-yl acetate

2-bromo-5-(triethylsilyloxy)pentene

(1S,4aR,5S,6S,9R,10R,11S,12S,12aS)-1,12-(Isopropylidenedioxy)-9,12a,13,13-tetramethyl-4-methylenetetradecahydro-6,10-methanobenzocyclodecene-5,6,9,10,11-pentaol

(4S,4aS,5S,6S,7R,8R,11S,12S,12aR)-11,12-(Carbonyldioxy)-4,5-(isopropylidenedioxy)-4a,8,13,13-tetramethyl-1-methylenetetradecahydro-7,11-methanobenzocyclodecene-5,7,8-triol

(4S,4aS,5S,6S,7R,8R,11S,12S,12aR)-11,12-(Carbonyldioxy)-7,8-dihydroxy-4,5-(isopropylidenedioxy)-4a,8,13,13-tetramethyl-1-methylenetetradecahydro-7,11-methanobenzocyclodecen-6-yl acetate