abstract |
The present invention relates to a compound of formula (I): [Chemical] [Wherein R 1 , R 2 , R 3 and R 4 each independently represent a hydrogen atom or a halogen atom, and R 5 and R 6 each independently represent a hydrogen atom or a lower alkyl group. Or R 5 and R 6 together represent an oxo group, X represents C (O) or the like, Y represents an oxygen atom or the like, Z represents a hydrogen atom or the like, and R represents nitrogen. A 5- or 6-membered heteroaryl group having 1 to 3 heteroatoms selected from the group consisting of an atom, a sulfur atom and an oxygen atom in the ring, or a pharmaceutically acceptable compound thereof Regarding salt. [Selection figure] None |