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(4S,8'R,9'R,10'R,13'S,14'S)-10',13'-Dimethyl-5-methylidenespiro[1,3-dioxolane-4,17'-2,6,7,8,9,11,12,14,15,16-decahydro-1H-cyclopenta[a]phenanthrene]-2,3'-dione


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