R factor = 0.042; wR factor = 0.129; data-to-parameter ratio = 14.3. In the title compound, C8H12O4S, the two five-membered rings both adopt envelope conformations. In the crystal, weak C— H O interactions link neighbouring molecules. Related literature The title compound is a precursor for the preparation of an important nucleoside drug. For applications of nucleosides in the fields of biology, drugs and chemistry, see: Goodyear et al. (2005); Simons (2001); Vittori et al. (2006). Data collection Rigaku Saturn CCD area-detecto
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