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

N-Nitroso Ondansetron Impurity 1
CAT No: CL-ONDT-NO-01 CAS No: NA Mol Wt: 374.1 Mol F: C17H18N4O4S Inv Status: Custom Synthesis
Chemical Name: 5-methoxy-2-(((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)sulfinyl)-1-nitroso-1H-benzo[d]imidazole
N-Nitroso Ondansetron Impurity 2
CAT No: CL-ONDT-NO-02 CAS No: NA Mol Wt: 308.3 Mol F: C17H16N4O2 Inv Status: Custom Synthesis
Chemical Name: 3-((2-Methyl-1H-imidazol-1-yl)methyl)-9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 3
CAT No: CL-ONDT-NO-03 CAS No: NA Mol Wt: 309.4 Mol F: C18H19N3O2 Inv Status: Custom Synthesis
Chemical Name: 3-((2-Methyl-1H-pyrrol-1-yl)methyl)-9-nitroso-1,2,3,4a,9,9a-hexahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 4
CAT No: CL-ONDT-NO-04 CAS No: NA Mol Wt: 271.32 Mol F: C15H17N3O2 Inv Status: Custom Synthesis
Chemical Name: 3-((dimethylamino)methyl)-9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 5
CAT No: CL-ONDT-NO-05 CAS No: NA Mol Wt: 613.72 Mol F: C36H35N7O3 Inv Status: Custom Synthesis
Chemical Name: 9-methyl-3-((2-methyl-1H-imidazol-1-yl)methyl)-6-((3-((2-methyl-1H-imidazol-1-yl)methyl)-9-nitroso-4-oxo-2,3,4,9-tetrahydro-1H-carbazol-6-yl)methyl)-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 6
CAT No: CL-ONDT-NO-06 CAS No: NA Mol Wt: 214.22 Mol F: C12H10N2O2 Inv Status: Custom Synthesis
Chemical Name: 9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 7
CAT No: CL-ONDT-NO-07 CAS No: NA Mol Wt: 226.24 Mol F: C13H10N2O2 Inv Status: Custom Synthesis
Chemical Name: 3-methylene-9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 8
CAT No: CL-ONDT-NO-08 CAS No: NA Mol Wt: 111.1 Mol F: C4H5N3O Inv Status: Custom Synthesis
Chemical Name: 2-methyl-1-nitroso-1H-imidazole
N-Nitroso Ondansetron Impurity 9
CAT No: CL-ONDT-NO-09 CAS No: NA Mol Wt: 294.31 Mol F: C16H14N4O2 Inv Status: Custom Synthesis
Chemical Name: 3-((1H-imidazol-1-yl)methyl)-9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 10
CAT No: CL-ONDT-NO-10 CAS No: NA Mol Wt: 295.14 Mol F: C12H11BrN2O2 Inv Status: Custom Synthesis
Chemical Name: N-(2-bromophenyl)-N-(3-oxocyclohex-1-en-1-yl)nitrous amide
N-Nitroso Ondansetron Impurity 11
CAT No: CL-ONDT-NO-11 CAS No: NA Mol Wt: 320.35 Mol F: C18H16N4O2 Inv Status: Custom Synthesis
Chemical Name: 3-((2-methyl-1H-imidazol-1-yl)methyl)-1-methylene-9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 12
CAT No: CL-ONDT-NO-12 CAS No: NA Mol Wt: 326.36 Mol F: C17H18N4O3 Inv Status: Custom Synthesis
Chemical Name: 2-((2-methyl-1H-imidazol-1-yl)methyl)-4-(1-nitroso-1H-indol-2-yl)butanoic acid
N-Nitroso Ondansetron Impurity 13
CAT No: CL-ONDT-NO-13 CAS No: NA Mol Wt: 58.02 Mol F: C3H3N3O Inv Status: Custom Synthesis
Chemical Name: 1-nitroso-1H-imidazole
N-Nitroso Ondansetron Impurity 14
CAT No: CL-ONDT-NO-14 CAS No: NA Mol Wt: 324.34 Mol F: C17H16N4O3 Inv Status: Custom Synthesis
Chemical Name: 6-hydroxy-3-((2-methyl-1H-imidazol-1-yl)methyl)-9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 15
CAT No: CL-ONDT-NO-15 CAS No: NA Mol Wt: 324.34 Mol F: C17H16N4O3 Inv Status: Custom Synthesis
Chemical Name: 7-hydroxy-3-((2-methyl-1H-imidazol-1-yl)methyl)-9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 16
CAT No: CL-ONDT-NO-16 CAS No: NA Mol Wt: 374.42 Mol F: C17H18N4O4S Inv Status: Custom Synthesis
Chemical Name: (R)-6-methoxy-2-(((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)sulfinyl)-1-nitroso-1H-benzo[d]imidazole
N-Nitroso Ondansetron Impurity 17
CAT No: CL-ONDT-NO-17 CAS No: NA Mol Wt: 324.34 Mol F: C17H16N4O3 Inv Status: Custom Synthesis
Chemical Name: 8-hydroxy-3-((2-methyl-1H-imidazol-1-yl)methyl)-9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron Impurity 18
CAT No: CL-ONDT-NO-18 CAS No: NA Mol Wt: 214.22 Mol F: C12H10N2O2 Inv Status: Custom Synthesis
Chemical Name: 9-nitroso-1,2,3,9-tetrahydro-4H-carbazol-4-one
N-Nitroso Ondansetron EP Impurity A
CAT No: CL-ONDT-NO-19 CAS No: NA Mol Wt: 271.32 Mol F: C15H17N3O2 Inv Status: In Stock
Chemical Name: N-methyl-N-((9-methyl-4-oxo-2,3,4,9-tetrahydro-1H-carbazol-3-yl)methyl)nitrous amide
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