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organic compounds
The two independent molecules of the title compound, C9H13NO4S2, are inverted with respect to each other but otherwise closely similar; unusually, a racemate thus crystallizes in a chiral space group (P212121 with Z = 8). As is normal for compounds R—N(SO2CH3)2, the C—N bonds [both 1.493 (3) Å] are lengthened with respect to standard values for acyclic amides. The independent molecules are linked into two independent chains by C—HO hydrogen bonding.