(8R,9S,10R,13S,14S,17S)-10,13-DIMETHYL-1,6,7,8,9,10,11,12,13,14,15,16-DODECAHYDRO-3'H-SPIRO[CYCLOPENTA[A]PHENANTHRENE-17,2'-FURAN]-3,5'(2H,4'H)-DIONE
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