The crystal structure of 2,4-dihydro-8-methoxy-4,4-dimefhyl-2-P-tolyl-1H-[1] benzopyrano-[4,3,2-cd] indol-1-one (C24H21NO3) was determined from single crystal X-ray diffraction data. The crystal belongs to the triclinic, space group P[FORMULA OMITTED], with a = 6.060(2), b = 12.276(5), c = 12.889(5) Å, α = 92.63(4), β = 90.78(4), γ = 95.71(3)°, Mr = 371.42, V = 952.92 Å3, Z = 2, Dcal = 1.29 Mg-m−3, Dm = 1.28Mg-m−3, λ (CuKα) = 1.54178 Å, µ = 0.60 mm−1, T = 293 K, F(000) = 392. The crystal structure was solved by direct methods and refined by least-squares to R = 0.038 and Rw = 0.043 for 2257 independent reflections. The pyran ring assumes a distorted boat conformation. © by R. Oldenbourg Verlag, München 1993