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[(3R,8R,9S,10R,13S,14S,17S)-10,13-Dimethyl-5'-methylidene-2'-oxospiro[1,2,3,4,7,8,9,11,12,14,15,16-dodecahydrocyclopenta[a]phenanthrene-17,4'-1,3-dioxolane]-3-yl] acetate


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