Crystal structure of 3,6-dihydroxy-4,5-dimethylbenzene-1,2-dicarbaldehyde

The title compound, C10H10O4, was synthesized from tetramethyl-1,4-benzoquinone. In the crystal, the almost planar molecule (r.m.s. deviation = 0.024 Å) forms intramolecular hydrogen bonds between the aldehyde and hydroxy groups and exhibits C2v symmetry. This achiral molecule crystallizes in the chiral space group P21 with intermolecular O—H...O and C—H...O hydrogen bonding and C—H...π and C=O...π interactions stabilizing the crystal packing.