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In the title co-crystal, C 10 H 8 N 2 ·C 8 H 7 NO 4 S, the formate group is coplanar with the pyridyl ring of the acid [dihedral angle = 6.2 (7)°], while the carb­oxy­methyl­sulfanyl group makes a C—S—C—C torsion angle of 70.2 (1)° with the pyridine ring. The dihedral angle between the pyridyl rings of the 4,4′-bipyridine mol­ecule is 27.4 (1)°. The acid and the 4,4′-bipyridine mol­ecules are involved in hydrogen bonding  via  carb­oxy­lic O and pyridyl N atoms. The structure is further consolidated by inter­molecular C—H⋯O hydrogen bonds, generating a three-dimensional network.

4,4′-Bipyridine–2-(carboxymethylsulfanyl)pyridine-3-carboxylic acid (1/1)