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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Febuxostat, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Febuxostat 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 Febuxostat-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.

Febuxostat Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-Descyano Febuxostat D9 Stable Isotopes CS-EO-02528 Not Available Enquire
Descarboxyl Febuxostat-d9 Stable Isotopes CS-T-101582 Not Available Enquire
Febuxostat D3 Stable Isotopes CS-O-44145 Not Available Enquire
Febuxostat D5 Stable Isotopes CS-O-44147 Not Available Enquire
Febuxostat-d7 Stable Isotopes CS-P-02585 1285539-74-3 In Stock
Febuxostat-d9 Stable Isotopes CS-O-06611 1246819-50-0 In Stock
3-Descyano 3-Bromo-febuxostat D9 Stable Isotopes CS-T-62864 144060-40-2 (Unlabeled) Enquire
3-Descyano Febuxostat D9 Ethyl Ester Stable Isotopes CS-T-62867 144060-97-9 (Unlabeled) Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Febuxostat API CS-O-11648 144060-53-7 In Stock
Febuxostat Hemihydrate API CS-EO-03552 442664-09-7 Enquire


Metabolite

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Febuxostat Metabolite 67M-1 Metabolite CS-P-02583 887945-96-2 In Stock
Febuxostat metabolite 67M-2 Metabolite CS-P-02584 407582-47-2 In Stock


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(Z)-hydroxyimino des-isobutyl Febuxostat impurity Impurity CS-O-53983 ---- Enquire
2-[3-(Aminocarbonyl)-4-(2-methylpropoxy)phenyl]-4-methyl-5-t... Impurity CS-T-47670 1239233-86-3 In Stock
3-Descyano 3-Bromo-febuxostat Impurity CS-O-46320 144060-40-2 Enquire
3-Descyano Febuxostat Impurity CS-T-62865 1206550-99-3 In Stock
3-Descyano Febuxostat Ethyl Ester Impurity CS-T-62866 144060-97-9 In Stock
3-Descyano-3-ethoxycarbonyl Febuxostat Impurity CS-P-08603 2476465-11-7 In Stock
4-Nitrophthalonitrile Impurity CS-M-56658 31643-49-9 In Stock
Desisobutyl Formyl Febuxostat Impurity CS-O-44196 1312815-35-2 Enquire
Ethyl 2-(3-formyl-2-hydroxyphenyl)-4-methylthiazole-5-carbox... Impurity CS-O-47911 Not Available Enquire
Ethyl 2-(3-formyl-4-hydroxyphenyl)-4- methylthiazole-5-carbo... Impurity CS-O-31550 161798-01-2 In Stock
Ethyl 2-(4-Hydroxyphenyl)-4-methylthiazole-5-carboxylate Impurity CS-TB-46788 161797-99-5 In Stock
Febuxostat 2-butanol Isomer Impurity CS-O-14983 1335202-59-9 In Stock
Febuxostat 2-Butyl Isomer Ethyl Ester Impurity CS-T-95877 2375033-35-3 Enquire
Febuxostat 67M-4 Impurity CS-T-62868 407582-49-4 In Stock
FEBUXOSTAT DEE IMPURITY Impurity CS-O-33959 1643131-93-4 In Stock
Febuxostat ethylester 4- n-propoxyphenyl impurity Impurity CS-O-44044 2985809-19-4 Enquire
Febuxostat ethylester 4-ethoxyphenyl impurity Impurity CS-O-57546 ---- Enquire
Febuxostat ethylester 4-Isopropoxyphenyl impurity Impurity CS-O-57547 144060-84-4 Enquire
Febuxostat ethylester Amide impurity Impurity CS-O-57545 1346238-15-0 Enquire
Febuxostat Impurity 23 Impurity CS-O-45292 2476465-06-0 Enquire
Febuxostat Impurity 28 Impurity CS-P-02569 1350352-70-3 In Stock
Febuxostat Impurity 32 Impurity CS-O-57540 1267681-15-1 Enquire
Febuxostat Impurity 39 Impurity CS-EO-02986 2646683-37-4 Enquire
Febuxostat Impurity 5 Impurity CS-T-51361 161798-02-3 In Stock
Febuxostat Impurity 6 Impurity CS-P-02568 1271738-74-9 In Stock
Febuxostat Impurity C Impurity CS-T-50354 1239233-87-4 In Stock
Febuxostat Isobutyl Ester Impurity Impurity CS-T-95853 Not Available Enquire
Febuxostat ISOMER 2 Impurity CS-O-44042 Not Available Enquire
Febuxostat ISOMER 3 Impurity CS-O-44043 ---- Enquire
Febuxostat Isopropyl Ester Impurity CS-T-62869 1346238-10-5 In Stock
Febuxostat Methyl Ester Impurity CS-TB-92189 923942-34-1 In Stock
Febuxostat t-Butyl Ether Acid Impurity Impurity CS-EO-02199 2418591-43-0 Enquire
Febuxostat-Nitro impurity Impurity CS-O-31545 144060-67-3 In Stock
Hydroxy Febuxostat Impurity CS-O-14920 407582-48-3 In Stock
Hydroxy Febuxostat descyano Acid impurity Impurity CS-O-57544 ---- Enquire
Hydroxy Febuxostat ethyl ester Descyano Amide impurity Impurity CS-O-57542 ---- Enquire
Hydroxy Febuxostat ethylester Amide impurity Impurity CS-O-57543 ---- Enquire
Hydroxy Febuxostat phosphonic acid impurity Impurity CS-O-57541 ---- Enquire
O-Desisobutyl O-n-Butyl Febuxostat Impurity CS-O-14982 1657014-33-9 In Stock
O-Desisobutyl O-n-Butyl Febuxostat Ethyl Ester Impurity CS-O-45587 2230270-05-8 In Stock
O-Desisobutyl O-propyl Febuxostat Impurity CS-P-02577 1530308-87-2 In Stock
2,2'-[4-(2-Methylpropoxy)-1,3-phenylene]bis[4-methyl-5-thiaz... Impurity CS-T-58615 1330632-48-8 Enquire
3-Cyano-4-isobutyloxythiobenzamide Impurity CS-O-10658 163597-57-7 Enquire
3-Descyano-3-formyl Febuxostat Isobutyl Ester Impurity CS-T-73945 1312815-36-3 Enquire
Bromo Febuxostat Impurity CS-O-14914 Enquire
Descyano Hydroxy Febuxostat Impurity CS-O-14915 886501-78-6 Enquire
Ethyl 2,2-dichloro-3-oxobutanoate Impurity CS-O-40974 6134-66-3 Enquire
Ethyl 2-chloroacetoacetate Impurity CS-CG-00174 609-15-4 Enquire
Febuxostat Butyl Ester Impurity Impurity CS-O-44382 1619982-02-3 Enquire
Febuxostat Impurity 10 Impurity CS-P-02571 Not Available Enquire
Febuxostat Impurity 12 Impurity CS-P-02572 Not Available Enquire
Febuxostat Impurity 13 Impurity CS-P-02573 Not Available Enquire
Febuxostat Impurity 14 Impurity CS-P-02574 1335202-60-2 Enquire
Febuxostat Impurity 15 Impurity CS-P-02575 Not Available Enquire
Febuxostat Impurity 16 Impurity CS-P-02576 Not Available Enquire
Febuxostat Impurity 18 Impurity CS-P-02578 Not Available Enquire
Febuxostat Impurity 19 Impurity CS-P-02579 118485-48-6 Enquire
Febuxostat Impurity 2 Impurity CS-O-31551 161798-03-4 Enquire
Febuxostat Impurity 20 Impurity CS-P-02580 Not Available Enquire
Febuxostat Impurity 21 Impurity CS-P-02581 Not Available Enquire
Febuxostat Impurity 22 Impurity CS-P-02582 Not Available Enquire
Febuxostat Impurity 30 Impurity CS-O-36189 2073891-59-3 Enquire
Febuxostat Impurity 8 Impurity CS-P-02570 144060-62-8 Enquire
Febuxostat Isopropyl isomer Impurity CS-O-14984 144060-52-6 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-(2-Methylpropoxy)-1,3-benzenedicarbothioamide Intermediate CS-T-57797 1330632-46-6 In Stock
4-hydroxy-3-nitrobenzenecarbothioamide Intermediate CS-O-31546 25984-63-8 In Stock
Febuxostat Ethyl Ester Intermediate CS-O-31552 160844-75-7 In Stock


Glucuronide

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Febuxostat acyl-beta-D-Glucuronide Glucuronide CS-O-05714 1351692-92-6 Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Febuxostat secondary standard Secondary Standards CS-SS-26631 144060-53-7 Enquire