(1S,2S,4bR,6aS,10aS,10bR,12aS)-4b,7,7,10a,12a-Pentamethyl-3-oxo-octadecahydro-chrysene-1,2-dicarboxylic acid dimethyl ester

(1S,2S,3S,4bR,6aS,10aS,10bR,12aS)-3-Methanesulfonyloxy-4b,7,7,10a,12a-pentamethyl-octadecahydro-chrysene-1,2-dicarboxylic acid dimethyl ester