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Cleanchem is a trusted provider of premium pharmaceutical reference materials, specializing in Methotrexate and its associated compounds. Our catalog includes pharmacopeial and non-pharmacopeial Methotrexate 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 Methotrexate-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 Methotrexate Impurity 1
CAT No: CL-MOXT-NO-01 CAS No: NA Mol Wt: 469.4 Mol F:  C19H19N9O6 Inv Status: Custom Synthesis
Chemical Name: (4-(((2,4-Diaminopteridin-6-yl)methyl)(nitroso)amino)benzoyl)-L-glutamic acid
N-Nitroso Methotrexate Impurity 2
CAT No: CL-MOXT-NO-02 CAS No: NA Mol Wt: 309.3 Mol F:  C13H15N3O6 Inv Status: In Stock
Chemical Name: (4-(Methyl(nitroso)amino)benzoyl)-L-glutamic acid
N-Nitroso-Methotrexate Hydrate Impurity B
CAT No: CL-MOXT-NO-03 CAS No: NA Mol Wt: 487.43 Mol F:  C19H21N9O7 Inv Status: Custom Synthesis
Chemical Name: (4-(((2,4-diaminopteridin-6-yl)methyl)(nitroso)amino)benzoyl)-L-glutamic acid hydrate
N-Nitroso-Methotrexate Impurity D
CAT No: CL-MOXT-NO-04 CAS No: NA Mol Wt: 341.29 Mol F: C14H11N7O4 Inv Status: Custom Synthesis
Chemical Name: 4-(((2-amino-4-oxo-1,4-dihydropteridin-6-yl)methyl)(nitroso)amino)benzoic acid
N-Nitroso-Methotrexate Impurity E
CAT No: CL-MOXT-NO-05 CAS No: NA Mol Wt: 340.3 Mol F: C14H12N8O3 Inv Status: Custom Synthesis
Chemical Name: 4-(((2,4-diaminopteridin-6-yl)methyl)(nitroso)amino)benzoic acid
N-Nitroso-Methotrexate Impurity F
CAT No: CL-MOXT-NO-06 CAS No: NA Mol Wt: 469.42 Mol F:  C19H19N9O6 Inv Status: Custom Synthesis
Chemical Name: (4-(((2,4-diaminopteridin-6-yl)methyl)(nitroso)amino)benzoyl)-D-glutamic acid
N-Nitroso-Methotrexate Impurity G
CAT No: CL-MOXT-NO-07 CAS No: NA Mol Wt: 604.58 Mol F: C27H28N10O7 Inv Status: Custom Synthesis
Chemical Name: (4-(4-(((2,4-diamino-4a,8a-dihydropteridin-6-yl)methyl)(methyl)amino)-N-nitrosobenzamido)benzoyl)-L-glutamic acid
N-Nitroso-Methotrexate Impurity H
CAT No: CL-MOXT-NO-08 CAS No: NA Mol Wt: 485.46 Mol F:  C20H23N9O6 Inv Status: Custom Synthesis
Chemical Name: (2S)-2-(4-(((2,4-diamino-4a,8a-dihydropteridin-6-yl)methyl)(nitroso)amino)benzamido)-5-methoxy-5-oxopentanoic acid
N-Nitroso Methotrexate Impurity I
CAT No: CL-MOXT-NO-09 CAS No: NA Mol Wt: 483.45 Mol F: C20H21N9O6 Inv Status: Custom Synthesis
Chemical Name: (S)-4-(4-(((2,4-diaminopteridin-6-yl)methyl)(nitroso)amino)benzamido)-5-methoxy-5-oxopentanoic acid
N-Nitroso -Methotrexate Impurity J
CAT No: CL-MOXT-NO-10 CAS No: NA Mol Wt: 483.45 Mol F:  C20H21N9O6 Inv Status: Custom Synthesis
Chemical Name: (S)-4-(4-(((2,4-diaminopteridin-6-yl)methyl)(nitroso)amino)benzamido)-5-methoxy-5-oxopentanoic acid
N-Nitroso -Methotrexate Impurity L
CAT No: CL-MOXT-NO-11 CAS No: NA Mol Wt: 309.28 Mol F: C13H15N3O6 Inv Status: In Stock
Chemical Name: (4-(methyl(nitroso)amino)benzoyl)-L-glutamic acid
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