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(R,R)-N-(2-Amino-1,2-diphenylethyl)-p-toluenesulfonamide
N-Acetyl-S-methyl-L-cysteine
丹参酮Ⅰ 对照品
毒死蜱氧化物
1-Methylnaphthalene Solution 100ug/ml in Toluene
2.2'.5-Tribromobiphenyl (无证书)
Cyclopropyl-1-d1 Methyl-d3 Ketone 标准品
甲基硫环磷
Phenamiphos Solution 100ug/ml in Acetonitrile
28种农药混标 标准品