2-Benzene­sulfonamido-3-methyl­butyric acid

In the crystal structure of the title compound, C₁₁H₁₅NO₄S, two independent mol­ecules are present per asymmetric unit; they are dimerized through O—H...O hydrogen bonds between their carb­oxy groups to generate R₂²(8) loops. An intra­molecular N—H...O link in one of the mol­ecules closes an S(5) ring. The dimers are linked by N—H...O and C—H...O hydrogen bonds to form a three-dimensional network. The C atoms of the isopropyl group of one of the mol­ecules are disordered over two orientations in a 3:1 ratio.