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Acetic acid (2S,3R,5S,9R,10R,13R,14S,17R)-3-acetoxy-14-hydroperoxy-10,13-dimethyl-6-oxo-17-[(S)-1-((R)-5-oxo-tetrahydro-furan-2-yl)-ethyl]-2,3,4,5,6,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-2-yl ester