Provided is a compound of Formula (I) below, or a pharmaceutically acceptable salt, metabolite, or prodrug thereof:wherein: A1 is CR4 or N； A2 is CR5R6 or NR7； A3 is CR5′；R6′； or NR7′；； each of R1, R2, R2′；, R3, R3′；, R4, R5, R5′；, R6, R6′；, R7, and R7′；, independently, is hydrogen, deuterium, halogen, cyano, hydroxyl, carboxyl, amino, formyl, nitro, C1-6 alkyl, C2-6 alkenyl, C2-6 alkynyl, C1-6 alkoxy, C2-6 alkenyloxy, C1-6 alkylcarbonyl, C1-6 alkyloxycarbonyl, C1-6 alkylamine, C3-20 carbocyclyl, or C3-20 heterocyclyl； or R5 and R6, R5′； and R6′；, or R5 and R5′；, together with the adjacent atom to which they are each attached, form C3-10 carbocyclyl or C3-10 heterocyclyl. Further provided are a method of using the above-described compound, or the pharmaceutically acceptable salt, metabolite, or prodrug thereof for treating influenza and a pharmaceutical composition containing same.
