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In the title mol­ecule, C 12 H 12 N 2 O 4 S, the S atom of the thia­diazine ring deviates by 0.5104 (4) Å from the mean plane of the other five atoms [largest deviation = 0.0623 (15) Å] giving a slightly distorted sofa conformation. The carb­oxy H atom was refined as disordered over two sets of sites with refined occupancies of 0.58 (2) and 0.48 (2). This corresponds to rotational disorder of the C=O and O—H groups about the attached C—C bond. In the crystal, O—H⋯O and N—H⋯O hydrogen bonds connect the mol­ecules into chains along [110].

2-(3,5-Dimethyl-1,1-dioxo-2H-1λ6,2,6-thiadiazin-4-yl)benzoic acid

2-(3,5-Dimethyl-1,1-dioxo-2H-1λ⁶,2,6-thiadiazin-4-yl)benzoic acid