Key indicators: single-crystal X-ray study; T = 193 K; mean (C-C) = 0.002 Å; R factor = 0.028; wR factor = 0.076; data-to-parameter ratio = 17.0.The title molecule, C 13 H 18 N 2 OS, is an oxadiazinanthione derived from (1R,2S)-norephedrine. There are two molecules in the asymmetric. Both adopt roughly half-chair conformations; however, the 5-position carbon orients out of opposite faces of the oxadiazinanthiones plane in the two molecules. In the crystal structure, they are oriented as a dimer linked by a pair of N-HÁ Á ÁS hydrogen bonds. The absolute configuration has been established from anomalous dispersion and confirms the known stereochemistry based on the synthetic procedure.
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