(R)-4-((7R,8R,9S,10R,12S,13R,14S,17R)-3,7,12-Trihydroxy-10,13-dimethyl-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-pentanoic acid methyl ester