2-butyl-1,3-diphenyl-2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazine

In the title compound, C28H27NO, the oxazine ring adopts a half- chair conformation. The dihedral angles between the phenyl rings and the naphthyl ring system are 15.34 (1) and 76.51 (1)degrees.