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A lead(II) coordination polymer,{[Pb2(butca)(H2O)2](H2O)2}n (1),has been synthe-sized by the hydrothermal reaction of Pb(OH)2 and 1,2,3,4-butanetetracarboxylic acid (H4butca) at 160 °C.Single-crystal X-ray analyses reveal that it crystallizes in mono