二甲双胍USP杂质B(盐酸盐) 货号:M016002B 英文名:Metformin USP Impurity B(Hydrochloride) 同义词:N-Methyl-imidodicarbonimidic diamide hydrochloride CAS号:1674-62-0 分子式:C3H9N5.HCl 分子量:115.09 35.98 询价订购