N-Butyl-4,6-diphenyl-pyrimidin-2-amine.

In the title compound, C(20)H(21)N(3), the pyrimidine ring is inclined at dihedral angles of 51.57 (4) and 2.49 (4)° to the two phenyl rings. The dihedral angle between the two terminal phenyl rings is 50.44 (4)°. In the crystal, adjacent mol-ecules are linked via a pair of N-H⋯N hydrogen bonds, forming an inversion dimer with an R(2) (2)(8) ring motif. Furthermore, the crystal structure is stabilized by a weak π-π inter-action, with a centroid-centroid distance of 3.6065 (5) Å.