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The absolute configuration has been determined for the title compound, C14H18N2O6S, a fluorescent dipeptide analogue, which can act as a rigid backbone chromophore in peptides. Intermolecular N—H...O=C hydrogen bonds [H...O = 2.37 (2) Å] are observed in the crystal packing.

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The absolute configuration has been determined for the title compound, C14H18N2O5S, a bicyclic aromatic building block which can act as a rigid fluorescence marker in peptide backbones. In the crystal packing, the two independent molecules of the asymmetric unit are aligned in an antiparallel manner as dimers which are stabilized by antiparallel inter­molecular N—H...O=C hydrogen bonds. In addition, there are weak inter­molecular C—H...O inter­actions.
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