Acta Cryst. (2002). E58, o1455-o1457  [ doi:10.1107/S1600536802021487 ]

S,S'-(But-2-yne-1,4-diyl)bis(L-cysteine) monohydrate

Y.-M. Shi and W.-Q. Zhang

Abstract: In the title compound, C₁₀H₁₆N₂O₄S₂·H₂O, both the (but-2-yne-1,4-diyl)bis(L-cysteine) moieties and the water molecule lie on crystallographic twofold axes. As a result of this symmetry, the two cysteine moieties (zwitterions), which are separated by the linear but-2-yne-1,4-diyl moiety, have exactly the same conformation. The conformation is characterized by the S atoms being anti to carboxyl groups and gauche to the protonated amino groups. There are hydrogen bonds which connect the structure in three dimensions.

Online 30 November 2002

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