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In the crystal structure of the title hydrated salt, poly[(μ2-aqua)(μ4-1-sulfido-β-D-glucoside)potassium], [K(C6H11O5S)(H2O)]n or K+·C6H11O5S·H2O, each thio­glucoside anion coordinates to four K+ cations through three of its four hy­droxy groups, forming a three-dimensional polymeric structure. The negatively charged thiol­ate group in each anion does not form an efficient coordination bond with a K+ cation, but forms inter­molecular hydrogen bonds with four hy­droxy groups, which appears to sustain the polymeric structure. The Cremer–Pople parameters for the thio­glucoside ligand (Q = 0.575, θ = 8.233° and φ = 353.773°) indicate a slight distortion of the pyran­ose ring.
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