Crystal structure of (2E)-1-(4-hydroxy-1-methyl-2-oxo-1,2-dihydroquinolin-3-yl)-3-(4-hydroxy-3-methoxyphenyl)prop-2-en-1-one

In the title compound, C20H17NO5, the dihedral angle between the mean plane of the dihydroquinoline ring system (r.m.s. deviation = 0.003 angstrom) and the benzene ring is 1.83 (11)degrees. The almost planar conformation is a consequence of an intramolecular O-H center dot center dot center dot O hydrogen bond and the E configuration about the central C=C bond. In the crystal structure, O-H center dot center dot center dot O hydrogen bonds generate chains of molecules along the [10 (1) over bar] direction. These chains are linked via pi-pi interactions [inter-centroid distances are in the range 3.6410 (16)-3.8663 (17) angstrom].