2,2′-(Disulfanediyl)dibenzoic acid–N,N′-bis­(3-pyridyl­meth­yl)ethane­diamide (1/1)

The asymmetric unit of the title cocrystal, C(14)H(14)N(4)O(2)·C(14)H(10)O(4)S(2), comprises a twisted 2,2'-(disulfanediyl)dibenzoic acid mol-ecule [dihedral angle between the benzene rings = 76.35 (10)°] and a U-shaped N,N'-bis-(3-pyridyl-meth-yl)ethane-diamide mol-ecule with the pyridyl groups lying to the same side of the central diamide moiety [C-C-C-N = 113.8 (2) and -117.6 (2)°]. The latter aggregate into supra-molecular tapes propagating along the a axis via centrosymmetric eight-membered amide {⋯OCNH}(2) synthons. Intra-molecular N-H⋯O hydrogen bonds are observed. The 2,2'-(disulfanediyl)dibenzoic acid mol-ecules form carbox-yl-pyridine O-H⋯N hydrogen bonds, bridging a pyridine residue below the plane of the tape and one above the plane with two inter-vening N,N'-bis-(3-pyridyl-meth-yl)ethane-diamide mol-ecules. The supra-molecular chains are consolidated in the crystal packing by C-H⋯O contacts. An inter-molecular C-H⋯S inter-action also occurs.