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

Fexofenadine Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(Decarboxy)-1-Oxo Fexofenadine-d10 Methanol Stable Isotopes CS-T-101627 Not Available Enquire
1-Oxo Fexofenadine-d10 Methyl Ester Stable Isotopes CS-T-94328 154477-55-1(Unlabelled) Enquire
Decarboxy Fexofenadine-d3 Stable Isotopes CS-T-101628 185066-37-9(unlabeled) Enquire
Fexofenadine-d10 Stable Isotopes CS-SN-00035 Not Available Enquire
Fexofenadine-d10 Hydrochloride Stable Isotopes CS-T-54704 1215821-44-5 Enquire
Fexofenadine-d10 Methyl Ester Stable Isotopes CS-T-100306 Not Available Enquire
Fexofenadine-d6 Stable Isotopes CS-O-02714 548783-71-7 In Stock
Fexofenadine-d6 Hydrochloride Stable Isotopes CS-O-46238 548783-71-7 (freebase) In Stock
meta-Fexofenadine-D6 Stable Isotopes CS-T-100307 479035-75-1(Unlabeled) Enquire
1-Dehydroxy-1-dehyro-fexofenadine-d6 Methyl Ester Stable Isotopes CS-T-51813 1795031-46-7 Enquire
Fexofenadine hydrochloride 13C12 Stable Isotopes CS-EK-02927 153439-40-8 unlabeled Enquire
Fexofenadine-D6 Methyl Ester Stable Isotopes CS-T-54706 1286458-00-1 Enquire


API

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Azacyclonol API CS-O-00907 115-46-8 In Stock
Fexofenadine API CS-T-54702 83799-24-0 In Stock
Fexofenadine Dihydrate API CS-O-47851 885946-90-7 Enquire
Fexofenadine Hydrochloride API CS-O-00610 153439-40-8 In Stock


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fexafenadine EP Impurity B Impurity CS-T-54703 479035-75-1 In Stock
Fexofenadine EP Impurity A Impurity CS-O-03405 76811-98-8 In Stock
Fexofenadine EP Impurity C Impurity CS-O-10070 185066-37-9 In Stock
Fexofenadine EP Impurity G Impurity CS-T-53856 1187954-57-9 Enquire
Fexofenadine Hydrochloride EP Impurity D Impurity CS-T-54705 154825-96-4 In Stock
Fexofenadine Impurity 37 Impurity CS-P-09159 24911-30-6 Enquire
Fexofenadine Impurity 4 Impurity CS-O-58091 1187954-56-8 Enquire
Fexofenadine N-Oxide Impurity CS-T-94016 1422515-52-3 In Stock
Fexofenadine Related Compound B Impurity CS-O-38699 479035-75-1 (Freebase) Enquire
Fexofenadine Related Compound C Impurity CS-BX-01373 185066-37-9 (free base) In Stock
Fexofenadine Tertiary dehydrated Impurity Impurity CS-O-42915 1347311-10-7 Enquire
FEXOFENADINE EP IMPURITY A - HCl Impurity CS-O-38203 153439-43-1 Enquire
Fexofenadine HCl Impurity L Impurity CS-O-33033 Not Available Enquire
Fexofenadine Hydrochloride EP Impurity F Impurity CS-O-14191 185066-33-5 Enquire
Fexofenadine hydrochloride USP Impurity A Impurity CS-EN-00073 Not Available Enquire
Fexofenadine P-Ethyl Ester Impurity CS-EO-00531 174483-06-8 Enquire
meta-Fexofenadine Hydrochloride Impurity CS-T-93671 479035-75-1 (Free Base) Enquire
methyl 2-(3-(4-chlorobutanoyl)phenyl)-2-methylpropanoate Impurity CS-O-15949 343255-26-5 Enquire
methyl 2-(4-(4-hydroxybutanoyl)phenyl)-2-methylpropanoate Impurity CS-O-15948 394222-30-1 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
4-(4-Chloro-1-oxobutyl)-α,α-dimethylbenzeneacetic Acid Methy... Intermediate CS-T-12201 154477-54-0 In Stock
Alpha α Dimethyl Phenyl Acetic Acid Methyl Ester Intermediate CS-CO-00002 57625-74-8 In Stock


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Ethyl4-(4-chloro-1-oxobutyl)-a,a-dimethylbenzeneacetate Fine Chemicals CS-O-10640 76811-97-7 In Stock
cyclopropyl(4-(1-hydroxy-2-methylpropan-2-yl)phenyl)methanon... Fine Chemicals CS-O-38671 169280-26-6 Enquire


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fexofenadine Secondary Standards CS-SS-25502 885946-90-7 Enquire
Fexofenadine HCl Secondary Standards CS-SS-24640-1GM 153439-40-8 Enquire
Fexofenadine HCl Secondary Standards CS-SS-24640 153439-40-8 Enquire
Fexofenadine methyl ester Secondary Standards CS-SS-26451-50MG 154825-96-4 Enquire
Fexofenadine Related Compound A Secondary Standards CS-SS-25288-50MG 76811-98-8 Enquire


Analytical Standard

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Fexofenadine-d6-AR Grade Analytical Standard CS-O-02714-10MG 548783-71-7 Enquire
Fexofenadine-d6-AR Grade-10 ppm/ACN Analytical Standard CS-O-02714-1ML 548783-71-7 Enquire