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