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Co-crystals formed between anthranilic acid and each of  N , N ′-bis(pyridin-2-ylmethyl)oxalamide ( 1 ) and  N , N ′-bis(pyridin-3-ylmethyl)oxalamide ( 2 ) have been formed from solutions containing 2:1 stoichiometric quantities of the reagents. In isomeric  1  and  2 , the oxaläamide groups have both amide and pyridyl groups capable for forming hydrogen bonding interactions with the äcomponents of anthranilic acid. However, it is the {C(=O)OH···N(py)} heterosynthon that persists in both crystal structures pointing to the robustness of this synthon when both carboxylic acids and pyridyl groups are found in co-crystals. In  1 , amine-H···O (oxalamide) and amide-H···N(amine) hydrogen bonds lead to layers that stack along the  c -axis via C—H···O (carbonyl) interactions. In  2 , the amine-H···O(oxalamide) hydrogen bonds lead to layers which are connected into a three-dimensional architecture by amide-N—H···O2 (carbonyl) interactions.

The robust {C(=O)OH···N(py)} heterosynthon persists in co-crystals formed between anthranilic acid and molecules with amide/pyridyl functionality