Acta Cryst. (2013). E69, o928 [ doi:10.1107/S1600536813013196 ]
Abstract: In the title compound, C21H17N2P, the dihedral angles between the 1,5-naphthyridine ring system (r.m.s. deviation = 0.005 Å) and the phenyl rings are 89.18 (8) and 77.39 (8)°. The phenyl rings are almost perpendicular, making a dihedral angle of 88.12 (8)°. The only possible intermolecular interaction is a very weak aromatic - stacking interaction [centroid-centroid separation = 3.898 (2) Å].
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