(1R,3aR,3bR,9aR,9bR,11aS)-1-acetyl-9a,11a-dimethyl-7-oxo-1,2,3,3a,3b,5,7,8,9,9a,9b,10,11,11a-tetradecahydrobenzo[c]cyclopenta[h]chromen-1-yl acetate