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A high-nuclear neodymium substituted octameric arsenotungstate Na4[H2N(CH3)2]18H21[Nd(H2O)7][W16Nd10O50(H2O)34(B-α-AsW9O33)8]·60H2O(1)was synthesized by reaction of the Na2WO4·2H2O,NaAsO2 and Nd(NO3)3·6H2O in the presence of dimethylamine hydrochloride in an aqueous medium.