Polycyclic pyridone derivative

A compound represented by the following formula (I) or a pharmaceutically acceptable salt thereof:

• wherein
• ring A is a substituted or unsubstituted non-aromatic heterocycle;
• ring C is a benzene ring or a pyridine ring;
• Q is a 5- or 6-membered aromatic heterocycle optionally substituted with one or more substituents selected from the group consisting of halogen, alkyl, haloalkyl, alkyloxy, haloalkyloxy, and alkylamino;
• each R1 is independently halogen, alkyl, haloalkyl, alkyloxy, cyano, or haloalkyloxy;
• L is substituted or unsubstituted alkylene;
• R3 is substituted or unsubstituted alkyl, substituted or unsubstituted non-aromatic carbocyclyl, or substituted or unsubstituted non-aromatic heterocyclyl;
• R4 is hydrogen, or substituted or unsubstituted alkyl;
• R3 and R4, or R3 and a substituent on ring A may be taken together with the adjacent atoms to form a substituted or unsubstituted non-aromatic heterocycle;
• and
• n is an integer of 1 to 3.