| abstract |
The present invention provides the following compounds having antiviral action. (A 1 is CR 1A R 1B , S or O; A 2 is CR 2 R 2 B , S or O; A 3 is CR 3 R 3 B , S or O; A 4 is CR 4 A R 4 B , S Or O; wherein the number of heteroatoms of the ring-constituting atoms constituted by A 1 , A 2 , A 3 , A 4 , a nitrogen atom adjacent to A 1 , and a carbon atom adjacent to A 4 is one or two; R 1A and R 1B is independently hydrogen, halogen or alkyl or the like; R 2A and R 2B are each independently hydrogen, halogen or alkyl or the like; R 3A and R 3B are each independently hydrogen, halogen or alkyl, etc. R 4A and R 4B are each independently hydrogen, halogen or alkyl, and R 3A and R 3B may be united to form a non-aromatic carbocyclic ring or a non-aromatic heterocyclic ring; X represents CH 2 , S or O R 1 is independently halogen or hydroxy, m is an integer of 0 to 2, and n is an integer of 1 to 2, |