In the title mol­ecule, C15H11ClO2, the ketone group is in the s‐cis conformation with respect to the olefinic double bond. The two aromatic rings form a dihedral angle of 26.07 (8)°. Screw‐related mol­ecules are linked via O—H⋯O hydrogen bonds, forming a chain along the c axis. Weak C—H⋯O and C—H⋯Cl interactions interconnect the chains into a three‐dimensional network.

The title molecule, C 17 H 16 O 4 , is nearly planar, with a dihedral angle of 6.64 (6) between the two aromatic rings. The con®guration of the keto group with respect to the ole®nic double bond is s-cis. OÐHÁ Á ÁO and CÐHÁ Á Á% hydrogen bonds link the molecules to form layers parallel to the ab plane. The crystal structure is further stabilized by a number of CÐHÁ Á ÁO interactions, which form rings of R 1 2 (5), R 1 2 (6) and R 2 1 (5) graph set motifs.

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Key indicatorsSingle-crystal X-ray study T = 183 K Mean '(C±C) = 0.004 A Ê R factor = 0.062 wR factor = 0.149 Data-to-parameter ratio = 17.0 For details of how these key indicators were automatically derived from the article, see

In the title compound, C23H19Br2NO4S, the orientation of the phenyl­sulfon­yl substituent with respect to the indole ring system is influenced by intra­molecular C—H⋯O inter­actions. The sulfon­yl‐bound phen­yl ring is orthogonal to the indole ring system. In the crystal structure, π–π stacking inter­actions involving the indole ring system link symmetry‐related mol­ecules into dimers.