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The title compound, C(7)H(5)NO(4), is essentially planar, with a maximum deviation from the mean plane of 0.0116 (11) angstrom for the hydroxy O atom. The molecular and crystal structure are stabilized by intra-and intermolecular interactions. An intramolecular O-H center dot center dot center dot O hydrogen bond generates a six-membered ring, producing an S(6) ring motif. The C-H center dot center dot center dot O interactions result in the formation of C(5) chains and R(2)(2)(8) rings forming an approximately planar network parallel to (101). These planes are interconnected through pi-pi interactions [centroid-centroid distance 3.582 (2) angstrom].