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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
5-Azido Oseltamivir-d3 Stable Isotopes CS-T-101880 Not Available Enquire
Oseltamivir Acetamide-d3 Stable Isotopes CS-O-16412 1093851-61-6 In Stock
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 Acid Stable Isotopes CS-T-99922 Not Available Enquire
Oseltamivir-13C2,d3 Phosphate Stable Isotopes CS-T-99921 Not Available Enquire
Oseltamivir-d3 (Ethyl-2,2,2-d3) Stable Isotopes CS-O-06838 196618-13-0(Unlabeled) In Stock
Oseltamivir-d3 Phosphate Stable Isotopes CS-O-03329 2734920-81-9 Enquire
Oseltamivir-d5 Stable Isotopes CS-O-57570 1093851-63-8 Enquire
Oseltamivir-d5 Hydrochloride Stable Isotopes CS-O-06842 2140263-19-8 In Stock
Oseltamivir Acid 13C D3 Stable Isotopes CS-O-06841 187227-45-8(Unlabeled) Enquire
Oseltamivir-d5 Phosphate Stable Isotopes CS-T-95301 Not Available Enquire


API

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


Metabolite

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


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(1S,5R,6S)-Ethyl 5-(Butan-2-yloxy)-7-oxabicyclo[4.1.0]hept-3... Impurity CS-O-47362 Not Available Enquire
1,2-Dihydro-oseltamivir Impurity CS-T-91141 1052063-38-3 Enquire
4-N-Desacetyl-5-N-acetyl Oseltamivir Impurity CS-T-15604 956267-10-0 In Stock
5-Azido Oseltamivir Impurity CS-T-48356 204255-06-1 In Stock
Acetamido azidesulfonamide Impurity CS-O-46176 Not Available Enquire
Ethyl (3R,4R,5S)-4-acetamido-5-(((5-formylfuran-2-yl)methyl)... Impurity CS-O-56487 ---- Enquire
Ethyl (3S, 4S, 5S)-4-acetamido-5-amino-3-(1- ethyl propoxy) ... Impurity CS-O-35947 Not Available Enquire
Ethyl(1S,5R,6S)-5-(pentan-2-yloxy)-7-oxabicyclo [4.1.0] hept... Impurity CS-O-56484 ---- Enquire
Oseltamivir 2-methyl sulfonamido impurity Impurity CS-O-59613 ---- Enquire
Oseltamivir Acid Methyl Ester Impurity CS-T-38115 208720-71-2 In Stock
OSELTAMIVIR CITRIC ACID ADDUCT Impurity CS-T-93528 Not Available In Stock
OSELTAMIVIR CITRIC ACID ADDUCT II Impurity CS-O-45307 Not Available Enquire
Oseltamivir diallyl amine impurity Impurity CS-EO-03275 651324-09-3 Enquire
Oseltamivir EP Imp R Impurity CS-O-43413 2762080-42-0 Enquire
Oseltamivir EP Imp U Impurity CS-O-43414 Not Available Enquire
Oseltamivir EP Impurity A Impurity CS-O-15800 1364932-19-3 In Stock
Oseltamivir Impurity 14 Impurity CS-EO-01347 2417645-75-9 Enquire
Oseltamivir Impurity 15 Impurity CS-P-08717 212504-89-7 In Stock
Oseltamivir Impurity 20 Impurity CS-EO-03742 651324-08-2 Enquire
Oseltamivir Impurity 22 Impurity CS-EO-01943 1052063-36-1 (free base) Enquire
Oseltamivir Impurity 23 Impurity CS-EO-01747 1035895-88-5 Enquire
Oseltamivir Impurity 23 HCl salt Impurity CS-O-57866 1035895-88-5 (Freebase) Enquire
Oseltamivir Impurity 26 Impurity CS-EO-01748 1402431-91-7 Enquire
Oseltamivir Impurity 26 HCl salt Impurity CS-O-57865 1402431-91-7 (Freebase) Enquire
Oseltamivir Impurity 27 Impurity CS-EO-01750 941296-96-4 (free base) Enquire
Oseltamivir Impurity 28 Impurity CS-EO-01749 2413185-95-0 Enquire
Oseltamivir Impurity 28 HCl salt Impurity CS-O-57839 2413185-95-0 (Freebase) Enquire
Oseltamivir Impurity 29 Impurity CS-O-56685 2081110-44-1 Enquire
Oseltamivir Impurity 4 Impurity CS-EO-01332 Not Available Enquire
Oseltamivir Impurity 41 Impurity CS-EO-02184 Not Available Enquire
Oseltamivir Impurity 48 Impurity CS-EO-02782 204254-98-8 Enquire
Oseltamivir Impurity 52 Impurity CS-EO-02783 1216260-26-2 Enquire
Oseltamivir Impurity 59 HCl salt Impurity CS-O-56684 2081110-43-0 (free base) Enquire
Oseltamivir Impurity 9 HCl Impurity CS-O-56486 ---- Enquire
Oseltamivir impurity-10 Impurity CS-O-56485 2717581-34-3 Enquire
Oseltamivir N-D-Glucitol Impurity CS-O-60177 2413185-91-6 Enquire
Oseltamivir Related Compound B Impurity CS-O-10377 1346604-18-9 In Stock
Rac- Oseltamivir hydroxymethyl furan Impurity CS-O-52358 Not Available Enquire
(-)-3-Dehydro Shikimic Acid Impurity CS-T-51807 2922-42-1 Enquire
(1R,5R,6R)-5-(1-Ethylpropoxy)-7-oxabicyclo[4.1.0]hept-3-ene-... Impurity CS-T-54574 1266663-89-1 Enquire
(1R,5S,6R)-Ethyl 5-(Pentan-3-yloxy)-7- oxabicyclo[4.1.0]hept... Impurity CS-O-37422 2413185-89-2 Enquire
(1S,5S,6S)-5-(1-Ethyl-propoxy)-7-oxa-bicyclo[4.1.0]hept-3-en... Impurity CS-O-35866 2413185-88-1 Enquire
(3R,4R,5R)-3,4-Dihydroxy-5-[(methylsulfonyl)oxy]-1-cyclohexe... Impurity CS-T-53254 220626-12-0 Enquire
(3R,4R,5R)-4-Acetylamino-5-amino-3-(1-ethyl-propoxy)-cyclohe... Impurity CS-O-35872 Not Available Enquire
(3R,4R,5R)-ethyl 4-(tert-butylamino)-5- (diallylamino)-3-(pe... Impurity CS-O-37426 Not Available Enquire
(3R,4R,5S)-ethyl 4-(tert-butylamino)-5- (diallylamino)-3-hyd... Impurity CS-O-37427 Not Available Enquire
(3R,4R,5S)-ethyl 4-(tert-butylamino)-5- hydroxy-3-(pentan-3-... Impurity CS-O-37423 Not Available Enquire
(3R,4R,5S)-ethyl 4-amino-5- (diallylamino)-3-(pentan-3- ylox... Impurity CS-O-37428 1055035-67-0 Enquire
(3R,4S,5R)-4-Acetylamino-5-amino-3-(1-ethyl-propoxy)-cyclohe... Impurity CS-O-35869 Not Available Enquire
(3R,4S,5R)-ethyl 5-(tert-butylamino)-4- (diallylamino)-3-(pe... Impurity CS-O-37425 Not Available Enquire
(3R,4S,5S)-ethyl 5-(tert-butylamino)-4- hydroxy-3-(pentan-3-... Impurity CS-O-37424 Not Available Enquire
(3S,4R,5R)-ethyl 4-acetamido-5-amino-3-(pentan-3-yloxy)cyclo... Impurity CS-O-37431 1240096-71-2 Enquire
(3S,4R,5S)-4-Acetylamino-5-amino-3-(1-ethyl-propoxy)-cyclohe... Impurity CS-O-35870 Not Available Enquire
(3S,4S,5R)-4-Acetylamino-5-amino-3-(1-ethyl-propoxy)-cyclohe... Impurity CS-O-35868 Not Available Enquire
3-Des(1-ethylpropoxy)-3-(1-methylpropoxy) Oseltamivir Impurity CS-T-52139 1052063-37-2 Enquire
ent-Oseltamivir Phosphate Impurity CS-T-38121 1035895-89-6 Enquire
ethyl 4-(pentan-3-yloxy)benzoate Impurity CS-O-37429 1508446-15-8 Enquire
N-Desacetyl 5-Azido Oseltamivir Impurity CS-T-15614 204255-04-9 Enquire
Oseltamivir 5-Desamino 5-(2-Formyl 5-Hydroxymethylpyrrol-1-y... Impurity CS-T-94054 Not Available Enquire
Oseltamivir Acid Methyl Ester Phosphate Salt Impurity CS-T-93755 208720-71-2 (free base) Enquire
OSELTAMIVIR CITRIC ACID ADDUCT 2 Impurity CS-O-34386 Not Available Enquire
Oseltamivir EP Impurity B Impurity CS-EO-00348 Not Available Enquire
Oseltamivir EP Impurity E HCl Impurity CS-RS-00112 208720-78-9 Enquire
Oseltamivir Fructose adduct-1 Impurity CS-EO-00096 Not Available Enquire
Oseltamivir Fructose adduct-2 Impurity CS-EO-00097 Not Available Enquire
Oseltamivir glucose adduct-2 Impurity CS-EO-00095 Not Available Enquire
Oseltamivir Impurity 15 Impurity CS-EO-01348 651324-06-0 Enquire
Oseltamivir Impurity 19 Impurity CS-P-08719 Not Available Enquire
Oseltamivir Impurity 24 Impurity CS-P-08718 Not Available Enquire
Oseltamivir Impurity 25 Impurity CS-P-08716 Not Available Enquire
Oseltamivir Impurity 31 Impurity CS-EO-01882 312904-17-9 Enquire
Oseltamivir Impurity 32 Impurity CS-EO-01883 356789-92-9 Enquire
Oseltamivir Impurity 6 Impurity CS-EO-01346 651324-04-8 Enquire
Oseltamivir Impurity 7 Impurity CS-EO-00098 Not Available Enquire
Oseltamivir Impurity 8 Impurity CS-P-08195 Not Available Enquire
Oseltamivir Phosphate Impurity B Impurity CS-O-51159 2413185-84-7 Enquire
Oseltamivir Pyrrole analog Impurity CS-O-36190 Not Available Enquire
Oseltamivir RRR Isomer Impurity CS-O-39386 2413185-96-1 Enquire
Oseltamivir RSR Isomer Impurity CS-O-39385 Not Available Enquire
Oseltamivir RSS Isomer Impurity CS-O-39384 Not Available Enquire
Oseltamivir-(3R,4S,5S)-isomer Impurity CS-O-35871 ---- Enquire
Oseltamivir-Glucose Adduct 1 Impurity CS-P-08172 Not Available Enquire
Rel 4-N-Desacetyl-5-N-acetyl Oseltamivir Acid Impurity CS-T-73947 1391047-93-0 Enquire
Tributylphosphine Oxide Impurity CS-T-44958 814-29-9 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
ethyl 3-(pentan-3-yloxy)benzoate Fine Chemicals CS-RS-00020 1151665-78-9 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
N-Nitroso Oseltamivir Impurity Nitrosamine CS-O-42888 ---- In Stock
Oseltamivir (3R,4S,5S)-5-amino-Nitroso Impurity Nitrosamine CS-O-47827 Not Available Enquire
Oseltamivir (3R,4S,5S)-5-azido-Nitroso Impurity Nitrosamine CS-O-47826 Not Available Enquire
Oseltamivir Nitroso Impurity 1 Nitrosamine CS-EO-02085 ---- In Stock
Oseltamivir Nitroso Impurity 2 Nitrosamine CS-EO-02086 ---- In Stock


Secondary Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Oseltamivir Phosphate Secondary Standards CS-SS-26641 204255-11-8 Enquire
Oseltamivir Phosphate Secondary Standards CS-SS-24729-500MG 204255-11-8 Enquire


Pharmaceutical Stds.

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Ethyl (3R,4R,5S)-4-N-Acetyl(1,1-dimethylethyl)amino-5-N,N-di... Pharmaceutical Stds. CS-TB-42849 651324-07-1 Enquire


Analytical Standard

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Oseltamivir acid D3-AR Grade Analytical Standard CS-O-03120-10MG 1242184-43-5 Enquire
Oseltamivir acid-d3-AR Grade-10 ppm/ACN Analytical Standard CS-O-03120-1ML 1242184-43-5 Enquire