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(2013/03/13)3,3-ethylenedioxy-5α-hydroxy-17β-cyano-17α-trimethylsilyloxy-11β-{4'-[1',1'-(ethylenedioxy)-2'2'2'-trifluoroethyl]phenyl}-estr-9-ene
3,3-ethylendioxy-5α,10α-epoxy-17α-(trimethylsilyloxy)-estr-9(11)-en-17β-carbonitrile
4'-bromo-trifluoroacetophenone ethylene glycol ketal