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The asymmetric unit of the title co-crystal solvate, C 14 H 10 O 4 S 2 ·2C 14 H 12 N 2 ·C 4 H 8 O, comprises a 2,2′-(disulfanedi­yl)dibenzoic acid mol­ecule, two mol­ecules of 2,9-dimethyl­phenanthroline and a tetra­hydro­furan (THF) solvent mol­ecule. Each end of the twisted diacid [dihedral angle between the benzene rings = 74.33 (17)°] forms a strong O—H⋯N hydrogen bond with a 2,9-dimethyl­phenanthroline mol­ecule, forming a trimeric aggregate. The crystal structure comprises layers of acid and THF mol­ecules, and layers of 2,9-dimethyl­phenanthroline mol­ecules that alternate along the  a  axis, the main connections between them being of the type C—H⋯O.

2,2′-(Disulfanediyl)dibenzoic acid–2,9-dimethylphenanthroline–tetrahydrofuran (1/2/1)