| Summary: | The asymmetric unit of the title compound {systematic name: sodium [2-({2-[(1-carboxylato-2-methyl-2-sulfanidylpropyl)amino]ethyl}amino)-3-methyl-3-sulfanidylbutanoato-κ4S,N,N′,S′]indate(III) tetrahydrate}, Na[In(C12H20N2O4S2)]·4H2O, contains four indate(III) complex anions {[In(d-ebp)]−; d-H4ebp = N,N′-ethyelenebis(d-penicillamine)], four sodium(I) cations and sixteen water molecules. The indate(III) anions and sodium cations are alternately connected through coordination bonds between Na+ ions and the carboxylate groups of the complex anions, forming an infinite sixfold right-handed helix along the c-axis direction. In the crystal, the helices are linked by O—H...O hydrogen bonds between water molecules bound to Na+ ions and carboxylate groups. The crystal studied was twinned via a twofold axis about [001].
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