Crystal structure of 2-methylamino-4-(6-methyl-4-oxo-4H-chromen-3-yl)-3-nitropyrano[3,2-c]chromen-5(4H)-one with an unknown solvate

In the title compound, C23H16N2O7, the mean planes of the two chromene units (r.m.s. deviations = 0.031 and 0.064 angstrom) are almost normal to one another with a dihedral angle of 85.59 (6)degrees. The central six-membered pyran ring has a distorted envelope conformation, with the methine C atom at the flap. There is an intramolecular N-H center dot center dot center dot O hydrogen bond, which generates 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)(6) ring motifs, forming zigzag chains along [001]. The chains are linked by a second pair of C-H center dot center dot center dot O hydrogen bonds, forming slabs parallel to (110). Within the slabs there are C-H center dot center dot center dot pi interactions present. A region of disordered electron density was treated with the SQUEEZE procedure in PLATON [Spek (2015). Acta Cryst. C71, 9-18] following unsuccessful attempts to model it as plausible solvent molecule(s). The given chemical formula and other crystal data do not take into account the unknown solvent molecule(s).