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In the anion of the title compound, C 5 H 12 N + ·C 10 H 8 NO 5 S − , the thia­zine ring adopts a distorted half-chair conformation and the enolic H atom is involved in an intra­molecular O—H⋯O hydrogen bond, forming a six-membered ring. The anions and cations are connected  via  N—H⋯N and N—H⋯O inter­actions.

Piperidinium 4-hydroxy-3-methoxycarbonyl-1,2-benzothiazin-2-ide 1,1-dioxide