(4R)-4-[(3R,5R,6E,8S,9S,10R,13R,14S,17R)-6-ethylidene-3-hydroxy-10,13-dimethyl-7-oxo-2,3,4,5,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]pentanoic acid