2-(4-Acetyl-3,5-dihydroxy-2-methyl-phenoxy)-4,6-dimethoxy-3-methyl- benzoic acid

In the title compound, C19H20O8, the benzene rings are nearly perpendicular to each other [dihedral angle 80.2 (2)degrees]. The carboxy group is twist ed out while both the methoxy and acetyl groups are almost coplanar with th eir attached benzene rings. The hydroxy group is involved in an intramolecu lar O-H . . .O hydrogen bond with the acetyl O atom and the compound is con nected through an intermolecular O-H . . .O contact to form a dimer. The cr ystal structure is stabilized by intermolecular O-H . . .O hydrogen bonds.