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, C(20)H(17)NO(5), the dihedral angle between the mean plane of the di­hydro­quinoline ring system (r.m.s. deviation = 0.003 Å) and the benzene ring is 1.83 (11)°. The almost planar conformation is a consequence of an intra­molecular O—H⋯O hydrogen bond and the E configuration about the central C=C bond. In the crystal structure, O—H⋯O hydrogen bonds generate chains of mol­ecules along the [10-1] direction. These chains are linked via π–π inter­actions [inter-centroid distances are in the range 3.6410 (16)–3.8663 (17) Å].