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In the title compound, alternatively called 3′-oxo­cyclo­hex-1′-eno-1′,6′:16,17–3-O-methyl­estra-1,3,5(10),16(16H)-tetraen-3-ol, C23H28O2, the cyclo­hexenone ring is fused to the five-membered ring through the α position at C16. As a result of the ring annelation, the distance between carbonyl and methoxy O atoms [12.994 (2) Å] is much longer than that in estrones or estradiol. The crystal packing is stabilized by C—H...O and C—H...π hydrogen-bonding interactions.

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In the title estrane derivative, C20H23BrO2, the five-membered ring adopts a conformation that is inter­mediate between twist and envelope. The C atom of the form­yl group and the bromo function are in close proximity. Close inter­molecular Br...Br and Br...C contacts are observed in the crystal structure.

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In the title compound, C15H18Cl2S2, the mol­ecule has a crystallographic twofold axis. The dihedral angle between the symmetry-related thio­phene rings is 85.54 (8)°.
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