N(6)-Acetyl-5,7-diphenyl-5,6,7,8-tetrahydro-benzo[b]-1,6-naphthyridine

The single-crystal X-ray diffraction study of the title molecule [alternative name: N(2)-acetyl-1,3-diphenyl-1,2,3,4-tetrahydrobenzo[b][1,6]naphthyridine], C26H22N2O, confirms that it is a 1,6-naphthyridine derivative whose structural characterization was not possible from H-1, (CNMR)-C-13 and mass spectral data. The tetrahydro-1,6-napthyridine ring has a boat conformation. The equatorial and axial orientations of the two phenyl groups and the coplanarity of the acetyl group with the tetrahydronaphthyridine ring are also confirmed.