Impurities and Working Standards
The following products are in stock and can be immediately dispatched when an order confirmation is received. Also, any non-listed Impurities could be provided after request.
C
Impurity A
Chemical Name: 1,1'-[Disulfanediylbis[(2S)-2-methyl-1-oxopropane-3,1-diyl]]bis[(2S)-
pyrrolidine-2-carboxylic] acid
(Captopril disulfide)
CAS No.: 64806-05-9
Cat. No.: BRI.CPT.A
Impurity A
Chemical Name: (−)-3-(3,4-Dihydroxyphenyl)-2-methyl-L-alanine sesquihydrate
CAS No.: 41372-08-1
Cat. No.: BRI.CRB.A
Impurity B
Chemical Name: Methyl (2S)-2-amino-3-(3,4-dihydroxyphenyl)-2-methylpropanoate
CAS No.: N/A
Cat. No.: BRI.CRB.B
Impurity E
Chemical Name: Methyl (2S)-3-(3,4-dihydroxyphenyl)-2-hydrazino-2-methylpropanoate
CAS No.: 52514-63-3
Cat. No.: BRI.CRB.E
Impurity F
Chemical Name: Ethyl (2S)-3-(3,4-dihydroxyphenyl)-2-hydrazino-2-methylpropanoate
CAS No.: 1458640-32-8
Cat. No.: BRI.CRB.F
Impurity J
Chemical Name: (2S)-3-(2-Bromo-4,5-dihydroxyphenyl)-2-hydrazino-2-methylpropanoic acid
(2-Bromo (S)-Carbidopa)
CAS No.: 43197-33-7
Cat. No.: BRI.CRB.J
Impurity A
Chemical Name: (6R,7R)-7-Amino-3-[[(5-methyl-1,3,4-thiadiazol-2-yl)sulfanyl]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
(7-ZACA)
CAS No.: 30246-33-4
Cat. No.: BRI.CFZ.A
Impurity E
Chemical Name: 5-Methyl-1,3,4-thiadiazol-2-thiol
CAS No.: 29490-19-5
Cat. No.: BRI.CFZ.E
Impurity H
Chemical Name: (6R,7R)-3-[(Acetyloxy)methyl]-7-amino-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
(7-Aminocephalosporanic Acid)
CAS No.: 957-68-6
Cat. No.: BRI.CFZ.H
Impurity 3
Chemical Name: (6R, 7R)-7-[[(Z)-2-(2-Amino-thiazol-4-yl)[[(carbmethoxy)methoxy]-imino]-acetyl]amino]-3-ethenyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
(Cefixime Methyl Ester)
CAS No.: 88621-01-6
Cat. No.: BRI.CFX.3
Impurity A
Chemical Name: (6R,7R)- 7-[[(2Z)-2-Aminothiazol-4-yl)-2-(methoxyimino)acetyl]amino]-3-methyl-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
(Deacetoxycefotaxime)
CAS No.: 65052-63-3
Cat. No.: BRI.CFT.A
Impurity C
Chemical Name: (6R,7R)-3-[(acetyloxy)methyl]-7-[[(2Z)-2-[2-(formylamino)thiazol-4-yl]-2-(methoxyimino)acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic Acid
(N-Formylcefotaxime)
CAS No.: 66403-32-5
Cat. No.: BRI.CFT.C
Impurity 1
Chemical Name: (E,Z)-2-(4-(2-Aminothiazol-4-yl)-5,8-dioxo-2,9-dioxa-3,6-diazaundec-3-en-7-yl)-3,6-dihydro-2H-1,3-thiazine-4-carboxylic acid
CAS No.: N/A
Cat. No.: BRI.CFZ.1
Impurity C
Chemical Name: 2-Methyl-3-sulfanyl-1,2-dihydro-1,2,4-triazine-5,6-dione
(Thiotriazinone)
CAS No.: 58909-39-0
Cat. No.: BRI.CFR.C
Impurity D
Chemical Name: S-Benzothiazol-2-yl (2Z)-(2-aminothiazol-4-yl)(methoxyimino)thioacetate
(Ceftriaxone Benzothiazolyl Oxime)
CAS No.: 80756-85-0
Cat. No.: BRI.CFR.D
Impurity B
Chemical Name: N-(Pyridin-2-yl)pyridin-2-amine
(2,2'-Dipyridylamine)
CAS No.: 1202-34-2
Cat. No.: BRI.CHL.B
Impurity A
Chemical Name: 1-(Diphenylmethyl)piperazine
CAS No.: 841-77-0
Cat. No.: BRI.CNN.A
Impurity D
Chemical Name: 3´´-N-Demethyl-6-O-methylerythromycin A
(N-Desmethyl clarithromycin)
CAS No.: 101666-68-6
Cat. No.: BRI.CLR.D
Impurity J
Chemical Name: (17R)-4′-Chloro-5′-ethyl-9-fluoro-11β-hydroxy-16β-methylspiro[androsta-1,4-diene-17,2′(3′H)-furan]-3,3′-dione
CAS No.: 1486466-31-2
Cat. No.: BRI.CLB.J
Impurity 1
Chemical Name: 2-(2-Chloroacetamido)-5-nitro-2'-chlorobenzophenone
(Chloroacetamido Impurity)
CAS No.: 180854-85-7
Cat. No.: BRI.CNZ.1
Impurity A
Chemical Name: (2-Amino-5-nitrophenyl)(2-chlorophenyl)methanone
CAS No.: 2011-66-7
Cat. No.: BRI.CNZ.A
