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Di(2-amino-5-methyl-1,8-naphthyridin-1-ium-7-carboxylato)dichlorocuprate(Ⅱ) di-hydrate has been prepared from 5,7-dimethyl-1,8-naphthyridine-2-amine,CuCl2·2H2O and concen-trated hydrochloride acid,and its structure was determined by X-ray diffraction