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The title compound, C(16)H(20)N(4)O(3)S·0.25CH(4)O·0.25H(2)O, is a hydrate/methanol solvate of torasemide, a diuretic drug used in the treatment of hypertension. The asymmetric unit contains two torasemide mol-ecules and half-occupied methanol and water mol-ecules. It is isomorphous with the previously reported nonsolvated T-II form of torasemide. The water mol-ecules contribute to the stability of the structure by participating in an extensive system of O-H⋯O hydrogen bonds; N-H⋯N and N-H⋯O hydrogen bonds are also present. Both asymmetric mol-ecules of torasemide form inversion dimers in the crystal.

4-(3-Methylanilino)-N-[N-(1-methylethyl)carbamoyl]pyridinium-3-sulfonamidate (torasemide) methanol 0.25-solvate 0.25-hydrate