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The structure of the title compound, crystallizing in space group P1 with Z= 1, was solved by Patterson methods. Full-matrix least-squares refinement was based on 579 counter-collected data corrected for absorption and anomalous dispersion. The final R is 0.021 (Rw=0"030). Bond lengths and angles in the sulphoxide group are compared with those of other organic sulphoxides. A short central C-C bond of 1.516 (2) A can be explained qualitatively as a secondary rehybridization effect on C caused by the electron-withdrawing property of the O atoms. Neglect of anomalous dispersion corrections gives rise to significant changes in scale factor and vibrational parameters for the heavier atoms in good agreement with quantitative predictions by Gilli & Cruickshank [Acta Cryst. (1973). B29, 1983-1985.The largest coordinate shift of an H atom corresponds to a change in the C-H length of 3a. Dispersion effects in the final difference map are small and cannot explain the observed negative density regions near the S atoms.

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