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1,2-Benzothia-zines similar to the title compound, C(18)H(18)N(2)O(4)S, are well known in the literature for their biological activities and are used as medicines in the treatment of inflammation and rheumatoid arthritis. The thia-zine ring adopts a distorted half-chair conformation. The enolic H atom is involved in an intra-molecular O-H⋯O hydrogen bond, forming a six-membered ring. In the crystal, mol-ecules arrange themselves into centrosymmetric dimers by means of pairs of weak inter-molecular N-H⋯O hydrogen bonds.
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