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

Omeprazole EP Impurity A
CAT No: CL-OPS-03 CAS No: 37052-78-1 Mol Wt: 180.2 Mol F: C8H8N2OS Inv Status: In Stock
Chemical Name: 5-Methoxy-1H-benzimidazole-2-thiol
Omeprazole EP Impurity C
CAT No: CL-OPS-05 CAS No: 73590-85-9 Mol Wt: 329.4 Mol F: C17H19N3O2S Inv Status: In Stock
Chemical Name: 5-Methoxy-2-[[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]sulphanyl]-1H-benzimidazole
Omeprazole EP Impurity D
CAT No: CL-OPS-06 CAS No: 88546-55-8 Mol Wt: 361.4 Mol F: C17H19N3O4S Inv Status: In Stock
Chemical Name: 5-Methoxy-2-[[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]sulphonyl]-1H-benzimidazole
Omeprazole EP Impurity E
CAT No: CL-OPS-07 CAS No: 176219-04-8 Mol Wt: 361.4 Mol F: C17H19N3O4S Inv Status: In Stock
Chemical Name: 4-Methoxy-2-[[(RS)-(5-methoxy-1H-benzimidazol-2-yl)sulfinyl]methyl]-3,5-dimethylpyridine 1-oxide
Omeprazole EP Impurity I
CAT No: CL-OPS-11 CAS No: 158812-85-2 Mol Wt: 377.4 Mol F: C17H19N3O5S Inv Status: In Stock
Chemical Name: 4-Methoxy-2-[[(5-methoxy-1H-benzimidazol-2-yl)sulfonyl]methyl]-3,5-dimethylpyridine 1-oxide?
Omeprazole Impurity 5
CAT No: CL-OPS-30 CAS No: 73590-87-1 Mol Wt: 299.4 Mol F: C16H17N3OS Inv Status: In Stock
Chemical Name: 2-(((4-Methoxy-3,5-dimethylpyridin-2-yl)methyl)thio)-1H-benzo[d]imidazole
Omeprazole EP Impurity XI
CAT No: CL-OPS-31 CAS No: 86604-75-3 Mol Wt: 185.65 : 36.46 Mol F: C9H12ClNO : HCl Inv Status: In Stock
Chemical Name: 2-(chloromethyl)-4-methoxy-3,5-dimethylpyridine hydrochloride
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