Cap-dependent endonuclease-IN-23 is a potent inhibitor of cap-dependent endonuclease ( CEN ). Cap-dependent endonuclease-IN-23 inhibits the replication of influenza virus. ap-dependent endonuclease-IN-23 has the potential for the research of influenza virus infection (influenza A) (extracted from patent WO2021233302A1, compound 8A or 8B).