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Featured Intermediates

Date of publication:2019/12/31 17:29:47
antiviral Buy the Anti-Viral Intermediates from the well-known pharma APIs and intermediates manufacturer - Huateng Pharma in China, such as oseltamivir intermediates, remdesivir intermediates, favipiravir impurities and baloxavir marboxil intermediates, etc. We are able to provide the services of Anti-Viral intermediates’ process development and scale-up production with capacities varying from gram to kilograms and multi tons. 

Huateng Pharma has an R&D base of 5,000 square meters and a smart pharmaceutical industrial park of 34,000 square meters. It is dedicated to the R&D and production of high-end biomedical chemical products, such as pharmaceutical intermediates, PEG derivatives, etc.  


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Below are our featured intermediates of anti-viral API.  
☛ Intermediates for Oseltamivir/Tamiflu
☛ Intermediates for Baloxavir Marboxil/XOFLUZA
☛ Intermediates for Remdesivir
☛ Intermediates for Favipiravir/Avigan

Intermediates for Oseltamivir/Tamiflu
Oseltamivir, sold under the brand name Tamiflu, is an antiviral medication used to treat and prevent influenza A and influenza B (flu).​ Email us if you are interested in the following oseltamivir intermediates.
204254-96-6 651324-09-3
CAS No. 204254-96-6 CAS. No 651324-08-2 CAS. No 651324-09-3
(1S,5R,6S)-Ethyl 5-(pentan-3-yl-oxy)-7-oxa-bicyclo[4.1.0]hept-3-ene-3-carboxylate (3R,4R,5S)-Ethyl 4-(N-(tert-butyl)acetamido)-5-(diallylamino)-3-(pentan-3-yloxy)cyclohex-1-enecarboxylate hydrochloride (3R,4R,5S)-ethyl 4-acetamido-5-(diallylamino)-3-(pentan-3-yloxy)cyclohex-1-enecarboxylate
1346604-18-9 1052063-37-2 651324-04-8
CAS No. 1346604-18-9 CAS. No 1052063-37-2 CAS NO. 651324-04-8
Ethyl 4-acetamido-3-hydroxybenzoat 3-Des(1-ethylpropoxy)-3-(1-methylpropoxy) Oseltamivir Oseltamivir Impurity 48
187227-45-8 204255-11-8
CAS No. 187227-45-8 CAS. No 204255-11-8  
Oseltamivir acid Oseltamivir phosphate  
Intermediates for Baloxavir Marboxil/XOFLUZA 
Baloxavir marboxil (trade name Xofluza®) is a new influenza (flu) antiviral drug approved by the FDA for treatment of acute uncomplicated flu within 2 days of illness onset in people 12 years and older who are otherwise healthy, or at high risk of developing flu-related complications. Intermediates of Baloxavir Marboxil, offered by us can be seen from the list shown below. Email us if you are interested in the following intermediates.
CAS No. 1985606-14-1 CAS NO. 1985607-83-7 ​CAS NO. 1985607-70-2
Baloxavir Marboxil 7,8-Difluoro-6,11-dihydrodibenzo[b,e]thiepin-11-ol (R)-7-(benzyloxy)-3,4,12,12a-tetrahydro-1H-[1,4]oxazino[3,4-c]pyrido[2,1-f][1,2,4]triazine-6,8-dione


CAS No. 2136287-66-4 CAS NO. 2136287-68-6 CAS NO. 1370250-39-7
7,8-Difluorodibenzo[b,e]thiepin-11(6H)-one (12aR)-7-(hexyloxy)-3,4,12,12a-tetrahydro-1H-[1,4]Oxazino[3,4-c]pyrido[2,1-f][1,2,4]triazine-6,8-dione 4-methylbenzenesulfonate 7-(Benzyloxy)-3,4,12,12a-tetrahydro-1H-[1,4]oxazino[3,4-c]pyrido[2,1-f][1,2,4]triazine-6,8-dione
Intermediates for Remdesivir
Remdesivir, sold under the brand name Veklury, is a broad-spectrum antiviral medication developed by the biopharmaceutical company Gilead Sciences. It is administered via injection into a vein. Remdesivir is being tested as a treatment for COVID‑19. Intermediates of Remdesivir, offered by us can be seen from the list shown below. Email us if you are interested in the following remdesivir intermediates.
1191578-98-9 55094-52-5 159326-68-8
CAS No. 1191578-98-9 CAS No. 55094-52-5 CAS No. 159326-68-8
2-(3-((4-((Ethoxyimino)methyl)-5-(4-(trifluoromethoxy)phenyl)isoxazol-3-yl)methoxy)phenyl)acetic acid 2,3,5-Tri-O-benzyl-D-ribonolactone Pyrrolo[2,1-f][1,2,4]triazin-4-amine
CAS No. 946511-97-3 CAS No. 1355049-92-1  CAS No. 1355357-49-1
Remdesivir amino ester compound Remdesivir Chloro compound  Remdesivir N-4 intermediate

​​Remdesivir API
CAS No. 1191237-69-0 CAS No. 1191237-80-5 CAS No. 1809249-37-3
GS-441524 Remdesivir N-2 intermediate Remdesivir API
Intermediates for Favipiravir/Avigan
Favipiravir is a new type of RNA polymerase inhibitor,  acting on viral genetic copying to prevent its reproduction. As another weapon for anti-viral treatment of influenza A and B, it was approved for marketing in Japan in March 2014. Studies have shown that, in addition to influenza viruses, Favipiravir may also exhibit good antiviral effects on a variety of RNA viruses, such as coronavirus(COVID-19), Ebola virus, sand virus, Bunia virus, and rabies virus, etc. Intermediates of Favipiravir, offered by us can be seen from the list shown below. Email us if you are interested in the following favipiravir intermediates.​
55321-99-8 259793-88-9 356783-16-9
CAS No. 55321-99-8 CAS No. 259793-88-9 CAS No. 356783-16-9
3-Hydroxypyrazine-2-carboxamide 6-Bromo-3-hydroxypyrazine-2-carboxamide (KSM precursor) 3,6-Dichloropyrazine-2-carbonitrile



CAS No. 356783-28-3 CAS No. 356783-31-8 CAS No. 259793-96-9
3,6-Difluoro-2-Pyrazinecarbonitrile 6-Fluoro-3-hydroxypyrazine-2-carbonitrile​ Favipiravir