4-Hydr-oxy-3-meth-oxy-5-nitro-aceto-phenone (5-nitro-apocynin).

The title mol-ecule, C(9)H(9)NO(5), is close to planar (r.m.s. deviation from the mean plane of the non-H atoms = 0.058†à ). The OH group forms a bifurcated O-H⋯(O,O) hydrogen bond, with the intra-molecular component to a nitro O atom and the inter-molecular component to a keto O atom, the latter resulting in chains along [20]. A C-H⋯O inter-action reinforces the packing.