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  • (3'R,3a'S,4aR,6aR,6bS,6'S,7a'R,9R,11aS,11bS)-3',6',10,11b-tetramethyl-3a',4,4a,4',5,5',6,6a,6b,6',7,7',7a',8,11,11a,11b,12-octadecahydro-3H,3'H-spiro[fluoreno[1,2-f]indazole-9,2'-furo[3,2-b]pyridine]

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