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The title compound, C 21 H 14 N 2 O 2 , was prepared by Pictet-Spengler cyclization of tryptamine and 4-formyl coumarin. In the mol-ecule, the dihedral angle between the mean planes of the coumarin and β-carboline ring systems is 63.8 (2)°. In the crystal, mol-ecules are linked via N-H⋯N hydrogen bonds, forming chains along the b -axis direction. Within the chains, there are a number of offset π-π inter-actions present [shortest inter-centroid distance = 3.457 (2) Å].

Crystal structure of 4-(4b,8a-dihydro-9H-pyrido[3,4-b]indol-1-yl)-7-methyl-2H-chromen-2-one