头孢克肟杂质标准品

头孢克肟杂质A. 2-[[(Z)-2-(2-aminothiazol-4-yl)-2-[(carboxymethoxy)imino]acetyl]amino]-2-[(2R)-5-methyl-7-oxo-1,2,5,7-tetrahydro-4H-furo[3,4-d][1,3]thiazin-2-yl]acetic acid Chemical Formula: C16H17N5O8S2 Molecular Weight: 471.46 头孢克肟杂质B 2-[[[(Z)-1-(2-aminothiazol-4-yl)-2-[[[(2R,5RS)-5-methyl-7-oxo-1,2,5,7-tetrahydro-4H-furo[3,4-d][1,3]thiazin-2-yl]methyl]amino]-2-oxoethylidene]amino]oxy]acetic acid Chemical Formula: C15H17N5O6S2 Molecular Weight: 427.46 头孢克肟杂质C (6R,7S)-7-[[(Z)-2-(2-aminothiazol-4-yl)-2-[(carboxymethoxy)imino]acetyl]amino]-3-ethenyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid (cefixime 7-epimer) Chemical Formula: C16H15N5O7S2 Molecular Weight: 453.45 头孢克肟杂质D (6R,7R)-7-[[(E)-2-(2-aminothiazol-4-yl)-2-[(carboxymethoxy)imino]acetyl]amino]-3-ethenyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid (cefixime E-isomer) Chemical Formula: C16H15N5O7S2 Molecular Weight: 453.45 头孢克肟杂质E (6R,7R)-7-[[(Z)-2-(2-aminothiazol-4-yl)-2-[(carboxymethoxy)imino]acetyl]amino]-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Chemical Formula: C15H15N5O7S2 Molecular Weight: 441.44 头孢克肟杂质F (6R,7R)-7-[[(Z)-2-(2-aminothiazol-4-yl)-2-[(2-ethoxy-2-oxoethoxy)imino]acetyl]amino]-3-ethenyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid Chemical Formula: C18H19N5O7S2 Molecular Weight: 481.50