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Two novel rare earth tungstosilicic polyoxometalate containing 5-fluorouracil,K26(C4H4FN2O2)8Pr(SiW11O39)4·10H2O(FPSW) and K26(C4H4FN2O2)8Sm(SiW11O39)4·9H2O(FSSW),were synthesized and their structure were characterized by using elemental analysi