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Cleanchem is a trusted provider of premium pharmaceutical reference materials, specializing in Cloxacillin and its associated compounds. Our catalog includes pharmacopeial and non-pharmacopeial Cloxacillin 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 Cloxacillin-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.

Cloxacillin Sodium
CAT No: CL-CLX-01 CAS No: 642-78-4 Mol Wt: 434.9 : 23.0 Mol F: C19H17ClN3O5S. Na Inv Status: Custom Synthesis
Chemical Name: (2S,5R,6R)-6-[[[3-(2-Chlorophenyl)-5-methyl-1,2-oxazol-4-yl]carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate Sodium
Cloxacillin EP Impurity A
CAT No: CL-CLX-02 CAS No: 1642629-96-6 Mol Wt: 453.9 Mol F: C19H20ClN3O6S Inv Status: Custom Synthesis
Chemical Name: (4S)-2-[carboxy[[[3-(2-chlorophenyl)-5-methyl-1,2-oxazol-4-yl]carbonyl]amino]methyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid
Cloxacillin EP Impurity B
CAT No: CL-CLX-03 CAS No: 1642559-64-5 Mol Wt: 409.9 Mol F: C18H20ClN3O4S Inv Status: Custom Synthesis
Chemical Name: (2RS,4S)-2-[[[[3-(2-chlorophenyl)-5-methyl-1,2-oxazol-4-yl]carbonyl]amino]methyl]-5,5-dimethyl-1,3-thiazolidine-4-carboxylic acid
Cloxacillin EP Impurity C
CAT No: CL-CLX-04 CAS No: 551-16-6 Mol Wt: 216.3 Mol F: C8H12N2O3S Inv Status: Custom Synthesis
Chemical Name: 6-Aminopenicillanic Acid (6-APA) ; (2S,5R,6R)-6-amino-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
Cloxacillin EP Impurity D
CAT No: CL-CLX-05 CAS No: 23598-72-3 Mol Wt: 237.6 Mol F: C11H8ClNO3 Inv Status: Custom Synthesis
Chemical Name: 3-(2-Chlorophenyl)-5-methylisoxazole-4-carboxylic acid
Cloxacillin EP Impurity E
CAT No: CL-CLX-06 CAS No: NA Mol Wt: 634.1 Mol F: C27H28ClN5O7S2 Inv Status: Custom Synthesis
Chemical Name: (2S,5R,6R)-6-[[[(2S,5R,6R)-6-[[[3-(2-Chlorophenyl)-5-methyl-1,2-oxazol-4-yl]carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-yl]carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
Cloxacillin Impurity 1
CAT No: CL-CLX-07 CAS No: NA Mol Wt: 580.1 Mol F: C27H34ClN3O7S Inv Status: Custom Synthesis
Chemical Name: (2RS,4S)-3-(2-Ethylhexanoyl)-2-[carboxy[[[3-(2-chlorophenyl)-5-methylisoxazol-4-yl]carbonyl]amino]methyl]-5,5-dimethyl-thiazolidine-4-carboxylic acid
Cloxacillin Impurity 2
CAT No: CL-CLX-08 CAS No: NA Mol Wt: 730.6 Mol F: C32H29Cl2N5O9S Inv Status: Custom Synthesis
Chemical Name: (4R)-2-(carboxy(3-(2-chlorophenyl)-5-methylisoxazole-4-carboxamido)methyl)-3-((3-(2-chlorophenyl)-5-methylisoxazole-4-carbonyl)glycyl)-5,5-dimethylthiazolidine-4-carboxylic acid
Cloxacillin Penicilloic Penicillamide
CAT No: CL-CLX-09 CAS No: NA Mol Wt: 652.1 Mol F: C27H30ClN5O8S2 Inv Status: Custom Synthesis
Chemical Name: 2S,5R,6R)-6-{(R)-2-[(2R,4S)-4-Carboxy-5,5-dimethylthiazolidin-2-yl]-2-[3-(2-chlorophenyl)-5-methylisoxazole-4-carboxamido]acetamido}-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
Dicloxacillin Sodium
CAT No: CL-CLX-10 CAS No: 343-55-5 Mol Wt: 469.3 : 23.0 Mol F: C19H16Cl2N3O5S : Na Inv Status: Custom Synthesis
Chemical Name: Sodium (2S,5R,6R)-6-[[[3-(2,6-dichlorophenyl)-5-methyl-1,2-oxazol-4-yl]carbonyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate
Cloxacillin Impurity 3
CAT No: CL-CLX-11 CAS No: 303009-97-4 Mol Wt: 294.7 Mol F: C13H11ClN2O4 Inv Status: Custom Synthesis
Chemical Name: (3-(2-Chlorophenyl)-5-methylisoxazole-4-carbonyl)glycine
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