6-Chloro-2-methyl-2H-indazol-5-amine

6-Chloro-2-methyl-2H-indazol-5-amine (CAS 1893125-36-4) is a pharmaceutical-grade indazole intermediate used in the synthesis of ensitrelvir (S-217622), an oral 3C-like protease inhibitor developed as a COVID-19 antiviral with demonstrated activity against the Delta and Omicron variants. It is manufactured directly by Hunan HuaTeng Pharmaceutical Co., Ltd., which also offers CDMO services for COVID-19 drug production, to the supplier's in-house standard, and is sold into North America, Central/South America, Western and Eastern Europe, Australasia and Asia.