3-Hydroxy-3-(methoxycarbonyl)pentanedioic acid

Abstract

In the title compound, C7H10O7, the aliphatic chain is approximately planar [maximum deviation = 0.013 (1) Å] and makes a dihedral angle of 78.75 (7)° with the methoxycarbonyl group. In the crystal, molecules are linked via intermolecular O—H...O and C—H...O hydrogen bonds into sheets parallel to (100). In the sheet, O—H...O hydrogen bonds generate R22(9) and R22(8) ring motifs.