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The hydro­thermal reaction of Zn(CH 3 COO) 2 , NaOH and  l -cysteic acid produced the title compound, [Na 2 Zn(C 3 H 5 NO 5 S) 2 ]  n  . The Zn II  cation is situated on an inversion centre and is in a distorted octa­hedral environment, being chelated by two deprotoned  l -cysteic acid ligands through two amino N atoms and two carb­oxy­lic O atoms, with the two axial positions occupied by two carb­oxy­lic O atoms from two other  l -cysteic acid ligands. Each  l -cysteic acid ligand bridges five Na I  ions  via  its sulfonate group and two Zn II  ions  via  its carboxyl group, forming a three-dimensional framework. Weak N—H⋯O hydrogen bonding is observed in the crystal structure.

Poly[bis(μ7-3-sulfonato-L-alaninato)sodiumzinc]

Poly[bis(μ₇-3-sulfonato-L-alaninato)sodiumzinc]