不是日本研发的。此药叫Lagevrio，是英国的。用于抑制病毒复制

https://www.merck.com/news/merck-and-ridgebacks-molnupiravir-an-oral-covid-19-antiviral-medicine-receives-first-authorization-in-the-world/

https://pj.jiho.jp/article/246032