对羟基苯甲酸,4-Hydroxybenzoic acid [p-HBA];Pharmaceutical Secondary Standard; Certified Reference Material
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吡拉西坦,Piracetam;≥98%
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4-苯氧基丁酸,4-Phenoxybutanoic Acid
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硝酸钆(III)六水合物,Gadolinium(III) nitrate hexahydrate;crystals and lumps, 99.999% trace metals basis
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