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A new lanthanum complex,(H3O)2[La(C7H3NO5)2(H2O)2]2·3(H2O) or (H3O)2[La(HChel)2(H2O)2]2·3(H2O) 1 (H3Chel=4-hydroxypyridine-2,6-dicarboxylic(chelidamic) acid),has been prepared by the hydrothermal reaction,and its crystal structure was determined