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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Zafirlukast, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Zafirlukast impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Zafirlukast-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Zafirlukast Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-[2-Methoxy-4-[[[(2-methylphenyl)sulfonyl]amino]carbonyl]ph... Stable Isotopes CS-T-100062 Not Available Enquire
2-Chloro Zafirlukast-d7 Stable Isotopes CS-T-100619 Not Available Enquire
Zafirlukast Impurity D-d7 Stable Isotopes CS-T-99725 Not Available Enquire
Zafirlukast Impurity F-d7 Stable Isotopes CS-T-99724 Not Available Enquire
Zafirlukast Impurity G-d7 Stable Isotopes CS-T-99723 Not Available Enquire
Zafirlukast Impurity H-d11 Stable Isotopes CS-T-99722 Not Available Enquire
Zafirlukast-13C,d3 Stable Isotopes CS-O-14648 107753-78-6(Unlabeled) Enquire
Zafirlukast-13C-D6 Stable Isotopes CS-EO-02495 Not Available Enquire
Decyclopentyl Zafirlukast D3 Methyl Ester Stable Isotopes CS-O-13940 1795011-90-3 Enquire
Zafirlukast D7 Stable Isotopes CS-P-00089 1217174-18-9 Enquire
Zafirlukast m-Tolyl Isomer-D7 Stable Isotopes CS-O-37436 1794760-52-3 Enquire
Zafirlukast p-Tolyl Isomer-D7 Stable Isotopes CS-O-37435 1794886-13-7 Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Zafirlukast API CS-O-11222 107753-78-6 In Stock


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Zafirlukast M1 Metabolite Metabolite CS-T-94187 219583-10-5 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-(3-chloro-1-(naphthalen-1-yloxy)propyl)thiophene Impurity CS-O-44302 1104890-93-8 Enquire
2-Chloro Zafirlukast Impurity CS-T-93815 Not Available Enquire
4-[[5-cyclopentyloxycarbonylamino-2-[(3-methoxy benzoic acid... Impurity CS-O-44299 Not Available Enquire
4-[[5-cyclopentyloxycarbonylamino-2-[(3-methoxy benzoic acid... Impurity CS-O-44301 Not Available Enquire
4-[bis-(5-amino-1-methyl indol-3-yl)methyl]-3-methoxy benzoi... Impurity CS-O-44326 Not Available Enquire
4-[Bis-(5-cyclopentyloxy carbonyl amino-1-methyl indol-3-yl)... Impurity CS-O-44300 Not Available Enquire
4-[Bis-(5-cyclopentyloxy carbonyl amino-1-methyl indol-3-yl)... Impurity CS-O-44293 Not Available Enquire
dimethyl 4,4'-(1-(5-amino-1-methyl-1H-indol-3-yl)ethane-1,2-... Impurity CS-O-44327 Not Available Enquire
methyl 4-(5-nitro-1-methyl indol-3-yl-methyl)-3-methoxy benz... Impurity CS-O-44325 Not Available Enquire
Methyl N-(1-methyl-1H-indol-5-yl)carbamate Impurity CS-O-44292 1795185-03-3 Enquire
Zafirlukast Impurity D Impurity CS-T-87487 1160235-24-4 Enquire
1,1'-((propane-2,2-diylbis(4,1-phenylene))bis(oxy))bis(propa... Impurity CS-ED-02166 116-37-0 Enquire
2-[2-Methoxy-4-[[[(2-methylphenyl)sulfonyl]amino]carbonyl]ph... Impurity CS-T-79908 1160235-26-6 Enquire
4-[[5-[[(Cyclopentyloxy)carbonyl]amino]-1-methyl-1H-indol-3-... Impurity CS-T-51478 107754-19-8 Enquire
Zafirlukast Impurity F Impurity CS-O-37434 1160235-28-8 Enquire
Zafirlukast Impurity G Impurity CS-O-37433 1391990-94-5 Enquire
Zafirlukast Related Compound C Impurity CS-T-14678 1159195-67-1 Enquire
Zafirlukast Related Compound D Impurity CS-T-46710 1159195-69-3 Enquire
Zafirlukast Related Compound E Impurity CS-T-46712 1159195-70-6 Enquire


Analytical Standard

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Zafirlukast 13C,d3-AR Grade Analytical Standard CS-O-14648-10MG 107753-78-6(Unlabeled) Enquire
Zafirlukast 13C,d3-AR Grade-10 ppm/ACN Analytical Standard CS-O-14648-1ML 107753-78-6(Unlabeled) Enquire