(E)-6-Amino-1,3-dimethyl-5-[(pyridin-2-yl­methyl­idene)amino]­pyrimidine-2,4(1H,3H)-dione

In the title compound, C(12)H(13)N(5)O(2), a Schiff-base-derived chelate ligand, the non-aromatic heterocycle and its substituents essentially occupy one common plane (r.m.s. of fitted non-H atoms = 0.0503 Å). The N=C bond is E-configured. Intra­cyclic angles in the pyridine moiety cover the range 117.6 (2)–124.1 (2)°. Intra- and inter­molecular N—H⋯N and N—H⋯O hydrogen bonds are observed in the crystal structure, as are intra- and inter­molecular C—H⋯O contacts which, in total, connect the mol­ecules into a three-dimensional network. The shortest ring-centroid-to-ring-centroid distance of 3.5831 (14) Å is between the two different types of six-membered rings.