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