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Comparable to many amino acids, the title compound, C6H5NO3, is a substitution product of picolinic acid. The molecule shows approximate non-crystallographic Cs symmetry. Like many amino acids, the molecule is present in its zwitterionic state. Intra- as well as intermolecular hydrogen bonds are observed, the latter connecting the molecules into zigzag chains along the crystallographic b axis. An intermolecular C—C distance of only 3.368 (2) Å exclusively involving carbon atoms of aromatic rings (centroid–centroid separation = 3.803 Å) is indicative of π–π interactions connecting the molecules into stacks along the crystallographic a axis.