1-(4-{[(1,3,3-Tri­methyl­indolin-2-yl­idene)meth­yl]diazen­yl}phen­yl)ethanone

The title compound, C₂₀H₂₁N₃O, has crystallographic mirror symmetry with all non-H atoms apart from the methyl C atom of the CMe₂ group lying on the mirror plane. Mol­ecules are linked into planar sheets parallel to (010) by phen­yl–azo C—H...N and phen­yl–ethanone C—H...O inter­actions. Methyl C—H...π inter­actions provide crosslinking between the planes.