(2-Meth-oxy-1,3-phenyl-ene)diboronic acid

The molecular structure of the title compound, 2-CH3O—C6H3-1,3-[B(OH)2]2 or C7H10B2O5, features two intramolecular O—H...O hydrogen bonds of different strengths. One of the boronic acid groups is almost coplanar with the aromatic ring, whereas the second is significantly twisted. Molecules are linked by intermolecular O—H...O hydrogen bonds, generating infinite chains cross-linked to form a two-dimensional sheet structure aligned parallel to the (01overline{1}) plane.