Abstract
In the indane ring system of the title molecule, C13H12O4, the hydroxy-bearing C atom is 0.134 (1) angstrom out of the plane of the remaining essentially planar atoms (r.m.s. deviation = 0.010 angstrom). In the crystal, molecules are linked into chains along the b axis by intermolecular O-H center dot center dot center dot O hydrogen bonds. Additional stabilization is provided by weak intermolecular C-H center dot center dot center dot O hydrogen bonds.