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.
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