| Summary: | The title compound, C20H19N3O, was obtained by condensation of 2,3-dihydro-1H,9H-pyrrolo[2,1-b]quinazolin-9-one (alkaloid deoxyvasicinone, isolated from Peganum Harmala) with 4-(dimethylamino)benzaldehyde in the presence of sodium methoxide. The 2,3-dihydro-1H,9H-pyrrolo[2,1-b]quinazolin-9-one part of the molecule is roughly planar (r.m.s. deviation = 0.0178 Å) and is essentially coplanar with the benzilidene ring (r.m.s. deviation = 0.0080 Å), forming a dihedral angle of 5.0 (1)°. The crystal structure is stabilized by two aromatic π–π stacking interactions observed between the benzene rings of neighboring molecules [centroid–centroid distance = 3.7555 (19) Å.
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