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, C(22)H(13)BrN(2)O(7)·CHCl(3), the pyran ring adopts a shallow sofa conformation with the C atom bearing the bromo­chromene system as the flap [deviation = 0.291 (3) Å]. The dihedral angle between the pyran fused-ring system (all atoms; r.m.s. deviation = 0.032 Å) and the bromo­chromene ring system (r.m.s. deviation = 0.027 Å) is 87.56 (9)°. An intra­molecular N—H⋯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⋯O hydrogen bonds generate R (2) (2)(12) loops. The packing also features C—H⋯O and very weak π–π [centroid–centroid separation = 3.960 (2) Å] inter­actions, which link the dimers into a three-dimensional network.