The present invention relates to a compound represented by formula (I): (wherein R, R
2
, R
3
and R
4
each independently represent a hydrogen or halogen atom; R
5
and R
6
each independently represent a hydrogen atom or lower alkyl or together represent oxo; X represents C(O) or the like; Y represents an oxygen atom or the like; Z represents a hydrogen atom or the like; R represents 5- or 6-membered heteroaryl having 1-3 hetero atoms selected from the group consisting of nitrogen, sulfur and oxygen atoms, contained within a ring, or the like) or to a pharmaceutically acceptable salt thereof.
本发明涉及一种由式(I)表示的化合物:(其中R、R2、R3和R4分别独立地表示氢或卤素原子;R5和R6分别独立地表示氢原子或低级烷基或一起表示氧代基;X表示C(O)或类似物;Y表示氧原子或类似物;Z表示氢原子或类似物;R表示包含在环中的具有1-3个异原子(选自氮、
硫和氧原子)的5-或6元杂环芳基或类似物),或其药学上可接受的盐。