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

Leflunomide Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Hydroxy Leflunomide-d4 (Metabolite M2) Stable Isotopes CS-T-79405 1794789-76-6 Enquire
Leflunomide 13C6 Stable Isotopes CS-EK-00475 75706-12-6 unlabeled Enquire
Leflunomide-d4 Stable Isotopes CS-O-11466 1189987-23-2 In Stock


API Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Leflunomide API Standards CS-O-01811 75706-12-6 In Stock


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-METHYL-N-(4-((4-(TRIFLUOROMETHYL)PHENYL)CARBAMOYL)PHENYL)I... Impurities CS-O-44889 Not Available Enquire
Leflunomide EP Impurity A Impurities CS-T-62361 455-14-1 In Stock
Leflunomide EP Impurity C Impurities CS-O-13276 61643-23-0 In Stock
Leflunomide EP Impurity E Impurities CS-O-05797 208401-20-1 In Stock
Leflunomide EP Impurity F Impurities CS-O-13278 1403564-06-6 In Stock
Leflunomide EP Impurity G Impurities CS-O-13279 724429-16-7 In Stock
Leflunomide EP Impurity H Impurities CS-O-13280 24522-30-3 In Stock
Leflunomide Impurity 4 Impurities CS-O-57766 1903709-86-3 Enquire
Leflunomide Metabolite Ethyl Analog Impurities CS-O-44398 Not Available Enquire
Leflunomide Related Compound B Impurities CS-T-04169 108605-62-5 In Stock


EP Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Leflunomide for peak identification (Y0000674) EP Standards CS-EG-02925 75706-12-6 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Methylisoxazole-4-carboxylic Acid Intermediates CS-O-32251 42831-50-5 In Stock
Ethyl 3-methylisoxazole-4-carboxylate Intermediates CS-O-14369 20328-15-8 In Stock


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Ethyl 5-methylisoxazole-4-carboxylate Fine Chemicals CS-MM-48265 51135-73-0 In Stock