Abstract: The present invention provides a compound exhibiting coronavirus 3CL protease inhibitory activity or a pharmaceutically acceptable salt thereof, and a pharmaceutical composition comprising the same. Provided is a compound represented by Formula (I): wherein carbon atom a and carbon atom b are each a carbon atom constituting ring A, the ring A is substituted aromatic carbocycle or the like, R1 is substituted or unsubstituted aromatic heterocyclyl or the like, R2 is substituted or unsubstituted 6-membered aromatic carbocyclyl or the like, m is 1 or the like, R5as are each independently a hydrogen atom or the like, R5bs are each independently a hydrogen atom or the like, n is 1 or the like, R4a is a hydrogen atom or the like, and R4a is a hydrogen atom or the like. Alternatively, provided is a pharmaceutically acceptable salt of the compound.