Experimental Crystal data

main residue; R factor = 0.062; wR factor = 0.161; data-to-parameter ratio = 12.6. The title compound, C22H30N4O2, lies about a crystallographic inversion center. The whole molecule is disordered over two positions with a refined occupancy ratio of 0.636 (10): 0.364 (10). The pyridine rings are approximately planar, with maximum deviations of 0.033 (10) and 0.063 (17) A ̊ for the major and minor components, respectively. The mean planes of the pyridine rings form dihedral angles of 17 (2) in the major component and 18 (2) in the minor component with the respective formamide groups attached to them. In the crystal packing, intermolecular N—H O and C—H O hydrogen bonds link the molecules into two-dimensional networks parallel to the ab plane. Related literature For the importance of dicarboxylic acids and their derivatives