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The crystal structure of 2,5-dichlorobenzenesulphonic acid trihydrate has been determined from threedimensional single-crystal X-ray diffraction data recorded on a Stoe-Philips two-circle Weissenberg diffractometer at room temperature. The crystals are monoclinic, space group P21/c, with four formula units in a cell of dimensions a=7"350, b=23.516, c=6.862 ,&, /~= 100"68L The structure comprises oxonium ions tightly bonded to two water molecules to form HTO + ions. Very large anisotropy in thedoi:10.1107/s0567740872002626 fatcat:f6kemnjyqzaklcasbwcuywfmfa