Acta Cryst. (2002). E58, o975-o977  [ doi:10.1107/S1600536802013442 ]

trans-S,S'-(But-2-ene-1,4-diyl)bis(L-cysteine) dihydrate

Y.-M. Shi, F.-C. Gu, J.-P. Zhuang and W.-Q. Zhang

Abstract: In the title compound, C₁₀H₁₈N₂O₄S₂·2H₂O, the two cysteine moieties (zwitterions), separated by the rigid butene-1,4-diyl chain, adopt different conformations. These are characterized by the fact that the first S atom is anti to the carboxyl group in one moiety while the second S atom is gauche to both the carboxyl and protonated amino groups in the other moiety. The cysteine moieties and water molecules are linked by hydrogen bonds, forming a 14-membered ring within the ac plane and layer connections along the b axis, which bind the structure together in three dimensions.

Online 9 August 2002

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