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

Doxazosin EP Impurity F
CAT No: CL-DXZ-01 CAS No: 23680-84-4 Mol Wt: 239.66 Mol F: C10H10CIN3O2 Inv Status: Custom Synthesis
Chemical Name: 4-Amino2-chloro-6,7-dimethoxyquinazoline
Doxazosin Mesylate
CAT No: CL-DXZ-02 CAS No: 77883-43-3 Mol Wt: 451.5 : 96.1 Mol F: C23H25N5O5 : CH4O3S Inv Status: Custom Synthesis
Chemical Name: ?1-(4-Amino-6,7-dimethoxyquinazolin-2-yl)-4-[(2RS)-2,3-dihydro-1,4-benzodioxin-2-ylcarbonyl]piperazine methanesulphonate
Doxazosin EP Impurity B
CAT No: CL-DXZ-06 CAS No: 70918-74-0 Mol Wt: 248.3 : 36.5 Mol F: C13H16N2O3 : HCl Inv Status: In Stock
Chemical Name: N-(1,4-Benzodioxane-2-carbonyl)piperazine hydrochloride
Doxazosin EP Imp G
CAT No: CL-DXZ-07 CAS No: 60547-97-9 Mol Wt: 289.3 Mol F: C14H19N5O2 Inv Status: In Stock
Chemical Name: 6,7-dimethoxy-2-(piperazin-1-yl)quinazolin-4-amine
Doxazosin EP Impurity A
CAT No: CL-DXZ-08 CAS No: 3663-80-7 Mol Wt: 180.16 g/mol Mol F: C9H8O4 Inv Status: In Stock
Chemical Name: 1,4-Benzodioxane-2-carboxylic acid
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