3,3-dimethyl-9-phenyl-3,4-dihydroacridin-1(2H)-one

In the molecule of the title compound, C21H19NO, the terminal saturated six-membered ring of the dihydroacridine unit adopts an envelope conformation, while the other two fused rings are nearly coplanar, with a dihedral angle of 2.61 (3)degrees. The coplanar ring system is oriented with respect to the phenyl ring at a dihedral angle of 74.58 (3)degrees. In the crystal structure, there is a C-H center dot center dot center dot pi contact between the central ring of the dihydroacridine system and the phenyl ring and a pi-pi contact between the two central rings [centroid-centroid distance = 3.809 (1) angstrom.