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Cleanchem is a trusted provider of premium pharmaceutical reference materials, specializing in Cefaclor and its associated compounds. Our catalog includes pharmacopeial and non-pharmacopeial Cefaclor impurities, metabolites, nitrosamine derivatives (N-NO compounds), and stable isotope-labeled products. These reference standards play a critical role in pharmaceutical R&D, supporting activities such as product formulation, ANDA and DMF submissions, quality assurance, analytical method development, and stability assessments.
All Cefaclor-related substances undergo comprehensive characterization and are delivered with complete Certificates of Analysis and supporting analytical documentation to ensure regulatory adherence. Upon request, we can offer EP/USP traceable standards. Our products are routinely re-evaluated to maintain consistent quality and performance.

Cefaclor
CAT No: CL-CFLR-01 CAS No: 53994-73-3 Mol Wt: 367.8 Mol F: C15H14ClN3O4S Inv Status: In Stock
Chemical Name: (6R,7R)-7-[[(2R)-2-Amino-2-phenylacetyl]amino]-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Cefaclor EP Impurity A
CAT No: CL-CFLR-02 CAS No: 875-74-1 Mol Wt: 151.2 Mol F: C8H9NO2 Inv Status: Custom Synthesis
Chemical Name: (2R)-2-Amino-2-phenylacetic acid
Cefaclor EP Impurity B
CAT No: CL-CFLR-03 CAS No: 53994-69-7 Mol Wt: 234.7 Mol F: C7H7ClN2O3S Inv Status: Custom Synthesis
Chemical Name: 2,2?,2?,2???,2????,2?????[[8-(Piperidin-1-yl)pyrimido[5,4-d]pyrimidine-2,4,6-triyl]trinitrilo]hexaethanol
Cefaclor EP Impurity C
CAT No: CL-CFLR-04 CAS No: 143059-69-2 Mol Wt: 367.8 Mol F: C15H14ClN3O4S Inv Status: Custom Synthesis
Chemical Name: (6R,7R)-7-[[(2S)-2-amino-2-phenylacetyl]amino]-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Cefaclor EP Impurity E
CAT No: CL-CFLR-05 CAS No: 188915-50-6 Mol Wt: 355.8 Mol F: C14H14ClN3O4S Inv Status: Custom Synthesis
Chemical Name: 2-[[(2R)-2-Amino-2-phenylacetyl]amino]-2-(5-chloro-4-oxo-3,4-dihydro-2H-1,3-thiazin-2-yl)acetic acid
Cefaclor EP Impurity F
CAT No: CL-CFLR-06 CAS No: 2882-18-0 Mol Wt: 172.2 Mol F: C10H8N2O Inv Status: Custom Synthesis
Chemical Name: 3-Phenylpyrazin-2-ol ; 2-Hydroxy-3-phenylpyrazine
Cefaclor EP Impurity G
CAT No: CL-CFLR-07 CAS No:  67308-21-8 Mol Wt: 347.4 Mol F: C16H17N3O4S Inv Status: Custom Synthesis
Chemical Name:  (2R,6R,7R)- and (2S,6R,7R)-7-[[(2R)-2-Amino-2-phenylacetyl]amino]-3-methylene-8-oxo-5-thia-1-azabicyclo[4.2.0]octane-2-carboxylic acid
Cefaclor EP Impurity H
CAT No: CL-CFLR-08 CAS No:  Mol Wt: 501 Mol F: C23H21ClN4O5S Inv Status: Custom Synthesis
Chemical Name: (6R,7R)-7-[[(2R)-2-[[(2R)-2-Amino-2-phenylacetyl]amino]-2-phenylacetyl]amino]-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
S-Cefaclor Delta Isomer
CAT No: CL-CFLR-09 CAS No: 1448901-95-8 Mol Wt: 367.8 Mol F: C15H14ClN3O4S Inv Status: Custom Synthesis
Chemical Name: (2S,6R,7R)-7-((S)-2-amino-2-phenylacetamido)-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-3-ene-2-carboxylic acid
Benzyl Amine Analog Cefaclor
CAT No: CL-CFLR-10 CAS No: NA Mol Wt: 438.5 Mol F: C22H22N4O4S Inv Status: Custom Synthesis
Chemical Name: 7-(2-Amino-2-Phenylacetamido)-3-(4-Aminobenzyl)-8-Oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Cefaclor Dimer
CAT No: CL-CFLR-11 CAS No: NA Mol Wt: 717.6 Mol F: C30H26Cl2N6O7S2 Inv Status: Custom Synthesis
Chemical Name: (6R,7R)-7-((R)-2-((6R,7R)-7-((R)-2-Amino-2-phenylacetamido)-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxamido)-2-phenyl acetamido)-3-chloro-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Cefaclor Impurity 1
CAT No: CL-CFLR-12 CAS No: NA Mol Wt: 298.3 Mol F: C17H18N2O3 Inv Status: Custom Synthesis
Chemical Name: Methyl 2-(2-Amino-2-Phenylacetamido)-2-Phenylacetate
Cefaclor Impurity 2
CAT No: CL-CFLR-13 CAS No: NA Mol Wt: 438.5 : 2(114.0) Mol F: C22H22N4O4S : 2(C2HF3O2) Inv Status: Custom Synthesis
Chemical Name: (6R,7R)-7-((R)-2-Amino-2-phenylacetamido)-3-(4-aminobenzyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid compound with 2,2,2-trifluoroacetic acid (1:2)
Cefaclor Impurity 3
CAT No: CL-CFLR-14 CAS No: NA Mol Wt: 412.3 Mol F: C15H14BrN3O4S Inv Status: Custom Synthesis
Chemical Name: (6R,7R)-7-((R)-2-Amino-2-phenylacetamido)-3-bromo-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid
Cefaclor Impurity 4
CAT No: CL-CFLR-15 CAS No: NA Mol Wt: 348.4 Mol F: C20H20N4O2 Inv Status: Custom Synthesis
Chemical Name: (S)-2-Amino-N-(2-(6-oxo-5-phenyl-1,6-dihydropyrazin-2-yl)ethyl)-2-phenylacetamide
Cefaclor Impurity 5
CAT No: CL-CFLR-16 CAS No: 78591-31-8 Mol Wt: 348.4 Mol F: C20H20N4O2 Inv Status: Custom Synthesis
Chemical Name: (R)-2-Amino-N-(2-(6-oxo-5-phenyl-1,6-dihydropyrazin-2-yl)ethyl)-2-phenylacetamide
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