A 1:1 cocrystal of 4-(dimethylamino)benzaldehyde and 6-phenyl-1,3,5-triazine-2,4-diamine.

The crystal structure of the title compound, C(9)H(11)NO.C(9)H(9)N(5), contains one molecule of each component in the asymmetric unit. Approximately planar clusters of four molecules are formed by N-H...N and N-H...O hydrogen bonds, and further N-H...N hydrogen bonds link adjacent clusters to form pleated ribbons. pi-pi interactions are found between triazine and aldehyde benzene rings in different clusters, generating stacks along the monoclinic b axis. The intramolecular geometry of the two components is similar to that found in other crystal structures containing these molecules. Both molecules are approximately planar, except for methyl H atoms, with a small twist about the C-C bond linking the phenyl and triazine rings.