ceftiofur and its Impurities
Ceftiofur is used in cattle and pigs for treatment and control of infections caused by susceptible pathogens. It is an antibiotic of the cephalosporin type licensed for use in veterinary medicine.. Reference standards of Ceftiofur API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below


(6R,7R)-7-((E)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)-3-(((furan-2-carbonyl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid 5-Oxide
(6R,7R)-7-((E)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)-3-(((furan-2-carbonyl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid 5-Oxide
Catalogue No.:PA 03 31570
CAS :
NA
Molecular Formula : C19H17N5O8S3
Molecular Weight : 539.55


(6R,7R)-7-((Z)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)-3-(((furan-2-carbonyl)thio)methyl)-4,8-dioxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
(6R,7R)-7-((Z)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)-3-(((furan-2-carbonyl)thio)methyl)-4,8-dioxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
Catalogue No.:PA 03 31580
CAS :
NA
Molecular Formula : C19H15N5O8S3
Molecular Weight : 537.54


(6R,7R)-7-((Z)-2-(2-((Z)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)thiazol-4-yl)-2-(methoxyimino)acetamido)-3-(((furan-2-carbonyl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
(6R,7R)-7-((Z)-2-(2-((Z)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)thiazol-4-yl)-2-(methoxyimino)acetamido)-3-(((furan-2-carbonyl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
Catalogue No.:PA 03 0311000
CAS :
NA
Molecular Formula : C25H22N8O9S4
Molecular Weight : 706.74


(6R,7R)-7-((Z)-2-(2-((E)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)thiazol-4-yl)-2-(methoxyimino)acetamido)-3-(((furan-2-carbonyl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R)-7-((Z)-2-(2-((E)-2-(2-Aminothiazol-4-yl)-2-(methoxyimino)acetamido)thiazol-4-yl)-2-(methoxyimino)acetamido)-3-(((furan-2-carbonyl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Catalogue No.:PA 03 0311004
CAS :
NA
Molecular Formula : C25H22N8O9S4
Molecular Weight : 706.74


(6R,7R )-7-Amino-3-((furan-2-carbonylthio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
(6R,7R )-7-Amino-3-((furan-2-carbonylthio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Catalogue No.:PA 03 0311005
CAS :
80370-59-8
Molecular Formula : C13H12N2O5S2
Molecular Weight : 340.37