| abstract |
Formula (I) (Wherein R a represents a hydrogen atom and the like, and R 1 and R 2 are the same or different and each represents a hydrogen atom, optionally substituted lower alkyl or cycloalkyl, or R 1 and R 2 together with the adjacent nitrogen atom form a nitrogen-containing heterocyclic group, Z is a bicyclic heterocyclic group in which two 6-membered rings which may have a substituent are condensed, etc. Or a pharmaceutically acceptable salt thereof. |