Cap-dependent endonuclease-IN-5 is a potent inhibitor of cap-dependent endonuclease (CEN). Cap-dependent endonuclease-IN-5 inhibits influenza virus well, and/or has lower cytotoxicity, better in vivo pharmacokinetic properties and in vivo pharmacodynamic properties (extracted from patent WO2020078401A1, compound 13-1)[1].