Benzoic acid thiourea anti-influenza virus compounds as well as preparation method and use thereof

The invention relates to the field of medicinal chemistry and particularly relates to benzoic acid thiourea anti-influenza virus compounds (I) as well as a preparation method and medical use thereof. The compounds provided by the invention have remarkable inhibiting activity on influenza virus in vitro and vivo and have a good application prospect in treating influenza virus infectious diseases. R1, R2, R3 and R4 in the formula (I) are defined in the specification.