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Cleanchem is a trusted provider of premium pharmaceutical reference materials, specializing in Fosaprepitant and its associated compounds. Our catalog includes pharmacopeial and non-pharmacopeial Fosaprepitant 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 Fosaprepitant-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 Fosaprepitant
CAT No: CL-FSPP-NO-01 CAS No: NA Mol Wt: 643.4 Mol F: C23H21F7N5O7P Inv Status: Custom Synthesis
Chemical Name: (3-(((2R,3S)-2-((R)-1-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(4-fluorophenyl)morpholino)methyl)-4-nitroso-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl)phosphonic acid
N-Nitroso Fosaprepitant Impurity A
CAT No: CL-FSPP-NO-02 CAS No: NA Mol Wt: 563.42 Mol F: C23H20F7N5O4 Inv Status: Custom Synthesis
Chemical Name: 5-(((R)-2-(2-((S)-1-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-4-fluorophenyl)morpholino)methyl)-1-nitroso-1H-1,2,4-triazol-3(2H)-one
N-Nitroso Fosaprepitant Impurity 1
CAT No: CL-FSPP-NO-03 CAS No: NA Mol Wt: 466.35 Mol F: C20H17F7N2O3 Inv Status: In Stock
Chemical Name: (2R,3S)-2-((R)-1-(3,5-bis(trifluoromethyl)phenyl)ethoxy)-3-(4-fluorophenyl)-4-nitrosomorpholine
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