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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
Leflunomide-d4 Stable Isotopes CS-O-11466 1189987-23-2 In Stock
5-Hydroxy Leflunomide-d4 (Metabolite M2) Stable Isotopes CS-T-79405 1794789-76-6 Enquire
5-Methylisoxazole-3-carboxylic-d4 Acid Stable Isotopes CS-T-58317 1267623-84-6 Enquire
Leflunomide 13C6 Stable Isotopes CS-EK-00475 75706-12-6 unlabeled Enquire


API

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


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-METHYL-N-(4-((4-(TRIFLUOROMETHYL)PHENYL)CARBAMOYL)PHENYL)I... Impurity CS-O-44889 Not Available Enquire
Leflunomide EP Impurity A Impurity CS-T-62361 455-14-1 In Stock
Leflunomide EP Impurity C Impurity CS-O-13276 61643-23-0 In Stock
Leflunomide EP Impurity E Impurity CS-O-05797 208401-20-1 In Stock
Leflunomide EP Impurity F Impurity CS-O-13278 1403564-06-6 In Stock
Leflunomide EP Impurity G Impurity CS-O-13279 724429-16-7 In Stock
Leflunomide EP Impurity H Impurity CS-O-13280 24522-30-3 In Stock
Leflunomide Impurity 4 Impurity CS-O-57766 1903709-86-3 Enquire
Leflunomide Metabolite Ethyl Analog Impurity CS-O-44398 Not Available Enquire
Leflunomide Related Compound B Impurity CS-T-04169 108605-62-5 In Stock
2-Cyano-N-[2-(trifluoromethyl)phenyl]acetamide Impurity CS-M-27957 419534-37-5 Enquire
3-Trifluoromethyl Teriflunomide Impurity CS-O-33469 63927-52-6 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
5-Methylisoxazole-4-carboxylic Acid Intermediate CS-O-32251 42831-50-5 In Stock
Ethyl 3-methylisoxazole-4-carboxylate Intermediate 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
3-Methylisoxazole-4-carboxylic Acid Fine Chemicals CS-T-34159 17153-20-7 Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Leflunomide Secondary Standards CS-SS-24378-1GM 75706-12-6 Enquire
Leflunomide Related Compound A Secondary Standards CS-SS-24542-200MG 455-14-1 Enquire
Leflunomide Related Compound B Secondary Standards CS-SS-25626-50MG 108605-62-5 Enquire