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1-Methyl-4-(methylamino)piperidine dihydrochloride(有证书)
45种农药混标 Bepure-30508XB-b
First Standard® 正己烷中2,4-滴异辛酯溶液,100μg/mL
盐酸安非他酮溶液, 100ppm
1-Octanethiol
2,2’,3,3’,4,4’,5,5’-八氯联苯,100ug/ml于异辛烷 标准品
燕麦敌(标准品)[2303-16-4]
O,P'-滴滴涕 标准品
PUNYW25510523 Imipenem EP Impurity B
Pyruvic Acid