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

Oseltamivir Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Oseltamivir Acetamide-d3 Stable Isotopes CS-O-16412 1093851-61-6 In Stock
Oseltamivir Acid 13C D3 Stable Isotopes CS-O-06841 187227-45-8(Unlabeled) Enquire
Oseltamivir acid-d3 Stable Isotopes CS-O-03120 1242184-43-5 In Stock
Oseltamivir Phosphate 13CD3 Stable Isotopes CS-EO-02557 Not Available Enquire
Oseltamivir-13C2,d3 Phosphate Stable Isotopes CS-T-99921 Not Available Enquire
Oseltamivir-d3 (Ethyl-2 Stable Isotopes CS-O-06838 196618-13-0(Unlabeled) In Stock
Oseltamivir-d3 Phosphate Stable Isotopes CS-O-03329 2734920-81-9 In Stock
Oseltamivir-d5 Stable Isotopes CS-O-57570 1093851-63-8 Enquire
Oseltamivir-d5 Hydrochloride Stable Isotopes CS-O-06842 2140263-19-8 In Stock


API Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Oseltamivir API Standards CS-L-00146 196618-13-0 In Stock
Oseltamivir hydrochloride API Standards CS-P-08533 204255-09-4 Enquire
Oseltamivir Phosphate API Standards CS-O-02016 204255-11-8 In Stock


Metabolites

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Oseltamivir Carboxylic Acid Metabolites CS-O-07980 187227-45-8 In Stock


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(1R,5S,6R)-Ethyl 5-(Pentan-3-yloxy)-7- oxabicyclo[4.1.0]hept... Impurities CS-O-37422 2413185-89-2 Enquire
(1S,5S,6S)-5-(1-Ethyl-propoxy)-7-oxa-bicyclo[4.1.0]hept-3-en... Impurities CS-O-35866 2413185-88-1 Enquire
(3R,4R,5R)-4-Acetylamino-5-amino-3-(1-ethyl-propoxy)-cyclohe... Impurities CS-O-35872 Not Available Enquire
(3R,4R,5R)-ethyl 4-(tert-butylamino)-5- (diallylamino)-3-(pe... Impurities CS-O-37426 Not Available Enquire
(3R,4R,5S)-ethyl 4-(tert-butylamino)-5- (diallylamino)-3-hyd... Impurities CS-O-37427 Not Available Enquire
(3R,4R,5S)-ethyl 4-(tert-butylamino)-5- hydroxy-3-(pentan-3-... Impurities CS-O-37423 Not Available Enquire
(3R,4R,5S)-ethyl 4-amino-5- (diallylamino)-3-(pentan-3- ylox... Impurities CS-O-37428 1055035-67-0 Enquire
(3R,4S,5R)-4-Acetylamino-5-amino-3-(1-ethyl-propoxy)-cyclohe... Impurities CS-O-35869 Not Available Enquire
(3R,4S,5R)-ethyl 5-(tert-butylamino)-4- (diallylamino)-3-(pe... Impurities CS-O-37425 Not Available Enquire
(3R,4S,5S)-ethyl 5-(tert-butylamino)-4- hydroxy-3-(pentan-3-... Impurities CS-O-37424 Not Available Enquire
(3S,4R,5R)-ethyl 4-acetamido-5-amino-3-(pentan-3-yloxy)cyclo... Impurities CS-O-37431 1240096-71-2 Enquire
(3S,4R,5S)-4-Acetylamino-5-amino-3-(1-ethyl-propoxy)-cyclohe... Impurities CS-O-35870 Not Available Enquire
(3S,4S,5R)-4-Acetylamino-5-amino-3-(1-ethyl-propoxy)-cyclohe... Impurities CS-O-35868 Not Available Enquire
3-Des(1-ethylpropoxy)-3-(1-methylpropoxy) Oseltamivir Impurities CS-T-52139 1052063-37-2 Enquire
4-N-Desacetyl-5-N-acetyl Oseltamivir Impurities CS-T-15604 956267-10-0 In Stock
5-Azido Oseltamivir Impurities CS-T-48356 204255-06-1 In Stock
Acetamido azidesulfonamide Impurities CS-O-46176 Not Available Enquire
ent-Oseltamivir Phosphate Impurities CS-T-38121 1035895-89-6 Enquire
Ethyl (3R,4R,5S)-4-acetamido-5-(((5-formylfuran-2-yl)methyl)... Impurities CS-O-56487 Not Available Enquire
Ethyl (3S, 4S, 5S)-4-acetamido-5-amino-3-(1- ethyl propoxy) ... Impurities CS-O-35947 Not Available Enquire
ethyl 4-(pentan-3-yloxy)benzoate Impurities CS-O-37429 1508446-15-8 Enquire
Ethyl(1S,5R,6S)-5-(pentan-2-yloxy)-7-oxabicyclo [4.1.0] hept... Impurities CS-O-56484 Not Available Enquire
Oseltamivir 2-methyl sulfonamido impurity Impurities CS-O-59613 2375463-80-0 Enquire
Oseltamivir Acid Methyl Ester Impurities CS-T-38115 208720-71-2 In Stock
Oseltamivir Acid Methyl Ester Phosphate Salt Impurities CS-T-93755 208720-71-2 (free base) Enquire
OSELTAMIVIR CITRIC ACID ADDUCT Impurities CS-T-93528 Not Available In Stock
OSELTAMIVIR CITRIC ACID ADDUCT 2 Impurities CS-O-34386 Not Available Enquire
OSELTAMIVIR CITRIC ACID ADDUCT II Impurities CS-O-45307 Not Available Enquire
Oseltamivir diallyl amine impurity Impurities CS-EO-03275 651324-09-3 Enquire
Oseltamivir EP Imp R Impurities CS-O-43413 2762080-42-0 Enquire
Oseltamivir EP Imp U Impurities CS-O-43414 Not Available Enquire
Oseltamivir EP Impurity B Impurities CS-EO-00348 Not Available Enquire
Oseltamivir EP Impurity E HCl Impurities CS-RS-00112 208720-78-9 Enquire
Oseltamivir Fructose adduct-1 Impurities CS-EO-00096 Not Available Enquire
Oseltamivir Fructose adduct-2 Impurities CS-EO-00097 Not Available Enquire
Oseltamivir glucose adduct-2 Impurities CS-EO-00095 Not Available Enquire
Oseltamivir Impurity 14 Impurities CS-EO-01347 2417645-75-9 Enquire
Oseltamivir Impurity 15 Impurities CS-EO-01348 651324-06-0 Enquire
Oseltamivir Impurity 15 Impurities CS-P-08717 212504-89-7 In Stock
Oseltamivir Impurity 19 Impurities CS-P-08719 Not Available Enquire
Oseltamivir Impurity 22 Impurities CS-EO-01943 1052063-36-1 (free base) Enquire
Oseltamivir Impurity 23 Impurities CS-EO-01747 1035895-88-5 Enquire
Oseltamivir Impurity 23 HCl salt Impurities CS-O-57866 1035895-88-5 (Freebase) Enquire
Oseltamivir Impurity 24 Impurities CS-P-08718 Not Available Enquire
Oseltamivir Impurity 25 Impurities CS-P-08716 Not Available Enquire
Oseltamivir Impurity 26 Impurities CS-EO-01748 1402431-91-7 Enquire
Oseltamivir Impurity 26 HCl salt Impurities CS-O-57865 1402431-91-7 (Freebase) Enquire
Oseltamivir Impurity 27 Impurities CS-EO-01750 941296-96-4 (free base) Enquire
Oseltamivir Impurity 28 Impurities CS-EO-01749 2413185-95-0 Enquire
Oseltamivir Impurity 28 HCl salt Impurities CS-O-57839 2413185-95-0 (Freebase) Enquire
Oseltamivir Impurity 29 Impurities CS-O-56685 2081110-44-1 Enquire
Oseltamivir Impurity 41 Impurities CS-EO-02184 Not Available Enquire
Oseltamivir Impurity 48 Impurities CS-EO-02782 204254-98-8 Enquire
Oseltamivir Impurity 52 Impurities CS-EO-02783 1216260-26-2 Enquire
Oseltamivir Impurity 59 HCl salt Impurities CS-O-56684 2081110-43-0 (free base) Enquire
Oseltamivir Impurity 6 Impurities CS-EO-01346 651324-04-8 Enquire
Oseltamivir Impurity 7 Impurities CS-EO-00098 Not Available Enquire
Oseltamivir Impurity 8 Impurities CS-P-08195 Not Available Enquire
Oseltamivir Impurity 9 HCl Impurities CS-O-56486 Not Available Enquire
Oseltamivir impurity-10 Impurities CS-O-56485 2717581-34-3 Enquire
Oseltamivir N-D-Glucitol Impurities CS-O-60177 2413185-91-6 Enquire
Oseltamivir Nitroso Impurity 1 Impurities CS-EO-02085 Not Available In Stock
Oseltamivir Nitroso Impurity 2 Impurities CS-EO-02086 Not Available In Stock
Oseltamivir Pyrrole analog Impurities CS-O-36190 Not Available Enquire
Oseltamivir Related Compound A Impurities CS-BX-00719 3077786-48-9 Enquire
Oseltamivir Related Compound B Impurities CS-O-10377 1346604-18-9 In Stock
Oseltamivir-(3R,4S,5S)-isomer Impurities CS-O-35871 Not Available Enquire
Oseltamivir-Glucose Adduct 1 Impurities CS-P-08172 Not Available Enquire
Rac- Oseltamivir hydroxymethyl furan Impurities CS-O-52358 Not Available Enquire
Rel 4-N-Desacetyl-5-N-acetyl Oseltamivir Acid Impurities CS-T-73947 1391047-93-0 Enquire


EP Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Oseltamivir impurity C (Y0001340) EP Standards CS-EG-01019 187227-45-8 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1,2-Dihydro-oseltamivir Intermediates CS-T-91141 1052063-38-3 Enquire
Ethyl (3R,4R,5R)-3-(1-ethylpropoxy)-4-hydroxy-5-[(methylsulf... Intermediates CS-O-50890 204254-92-2 Enquire
N-Desacetyl 5-Azido Oseltamivir Intermediates CS-T-15614 204255-04-9 Enquire
Oseltamivir Acid Hydrochloride Intermediates CS-T-59969 1415963-60-8 Enquire
Oseltamivir Acid Potassium Salt Intermediates CS-T-59968 1363339-68-7 Enquire