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In the crystal structure of the title compound, C 13 H 15 NO 5 S, the mol­ecules exhibit weak S=O⋯H—C and C=O⋯H—C inter­molecular inter­actions and arrange themselves into centrosymmetric dimers by means of π–π inter­actions (ring centroids are separated by 3.619 Å, while the closest C⋯C contacts are 3.514 Å). 1,2-Benzothia­zines of this kind have a range of biological activities and are used as medicines in the treatment of inflammation and rheumatoid arthritis.

Methyl 4-ethoxy-2-methyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide