Crystal structure of 2,4-diamino-5-(4-hydroxy-3-methoxyphenyl)-8,8-dimethyl-6-oxo-6,7,8,9- tetrahydro-5H-chromeno[2,3-b]pyridine-3-carbonitrile--dimethylformamide--water (1/1/1).

In the structure of the title compound, C22H22N4O4⋯C3H7NO⋯H2O, the entire tricyclic system is approximately planar except for the carbon atom bearing the two methyl groups; the methoxyphenyl ring is approximately perpendicular to the tricycle. All seven potential hydrogen-bond donors take part in classical hydrogen bonds. The main molecule and the DMF combine to form broad ribbons parallel to the a axis and roughly parallel to the ab plane; the water molecules connect the residues in the third dimension. [ABSTRACT FROM AUTHOR]