Crystal structure of 4-(6-chloro-4-oxo-4H-chromen-3-yl)-2-methylamino-3-nitro-4H, 5H-pyrano[3,2-c] chromen-5-one chloroform monosolvate

In the title compound, C23H14Cl4N2O7, the pyran ring has an envelope conformation with the methine C atom as the flap. The chromene rings are almost planar (r. m. s. deviations of 0.027 and 0.018 angstrom) and their mean planes are inclined to one another by 85.61 (10) degrees. The mean planes of the pyran ring and the chromene ring fused to it are inclined to one another by 7.41 (13) degrees. The molecular structure is stabilized by an intramolecular N-H center dot center dot center dot O hydrogen bond, generating an S(6) ring motif. In the crystal, molecules are linked by pairs of N-H center dot center dot center dot O hydrogen bonds, forming inversion dimers with an R-2(2)(12) ring motif. The dimers are linked by pairs of C-H center dot center dot center dot O hydrogen bonds, enclosing R-2(2)(18) ring motifs, forming chains along [010]. Within the chains there are C-H center dot center dot center dot pi interactions. The chains are linked via slipped parallel pi-pi interactions, forming a three-dimensional structure [the shortest inter-centroid distance is 3.7229 (19) angstrom].