Abstract
In the title compound, C
13
H
11
NO
4
S, the dihedral angle between the planes of the benzene ring and the carboxyl group is 13.7 (1)°. The molecular structure contains intramolecular N—H⋯O and C—H⋯O hydrogen-bonding interactions, while the crystal packing is stabilized by C—H⋯O and O—H⋯O hydrogen bonds and C—H⋯π interactions. The O—H⋯O hydrogen bonds form a cyclic dimer, with graph-set motif
R
2
2
(8), about a centre of symmetry.