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The title compound, C 28 H 22 O 6 S 2 ·2C 6 H 13 N·2H 2 O, was prepared by the reaction of a Wittig reagent and 2-formyl­benzene­sulfonic acid. The main molecule lies about an inversion centre at the midpoint of the C—C bond between the inner benzene rings. The mol­ecular conformation is stabilized by intramolecular  hydrogen bonds. The crystal structure is further stabilized by O—H⋯O and N—H⋯O hydrogen-bonding inter­actions.

2,2′-[(Biphenyl-4,4′-diyl)di(ethene-1,2-diyl)]dibenzenesulfonic acid–4-methylpiperidine–water (1/2/2)