10,12-Dimethylpteridino[6,7-f][1,10]- phenanthroline-11,13(10H,12H)-dione– chloroform (1/1)

In the title co-crystal, C18H12N6O2_CHCl3, intramolecular Cl3C—H_ _ _N hydrogen-bonding interactions occur between a single CHCl3 and both N atoms at the 1,10-positions on the phenanthroline portion of the molecule. The interplanar distance between inversion-related molecules is 3.241 (2) A °