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

In the title compound, C22H13BrN2O7 center dot CHCl3, the pyran ring adopts a shallow sofa conformation with the C atom bearing the bromochromene system as the flap [deviation = 0.291 (3) angstrom]. The dihedral angle between the pyran fused-ring system (all atoms; r.m.s. deviation = 0.032 angstrom) and the bromochromene ring system (r.m.s. deviation = 0.027 angstrom) is 87.56 (9)degrees. An intramolecular N-H center dot center dot center dot O hydrogen bond closes an S(6) ring. The Cl atoms of the solvent molecule are disordered over two sets of sites in a 0.515 (6): 0.485 (6) ratio. In the crystal, inversion dimers linked by pairs of N-H center dot center dot center dot O hydrogen bonds generate R-2(2)(12) loops. The packing also features C-H center dot center dot center dot O and very weak pi-pi [centroid-centroid separation = 3.960 (2) angstrom] interactions, which link the dimers into a three-dimensional network.