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The title compound crystallizes in the orthorhombic space group Pbca. In the crystal structure, the two H atoms of sulfuric acid protonate the carbonyl groups of two urea molecules. The H-O(urea) distances are 0.83 (3) and 0.87 (2) A, with O(urea)-O(sulfate) distances of 2.544 (2) and 2.571 (2) A, respectively.
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Chen et al. (1999) studied this question.
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