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Methanesulfonic acid (E)-(R)-6-((1S,3R,8S,9S,10R,13R,14S,17R)-1,3-bis-methoxymethoxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-2,3,3-trimethyl-hept-4-enyl ester