| abstract |
Formula (I): [Chemical 1] (In the formula, R 1 is ethyl optionally substituted with halogen or amino optionally substituted with lower alkyl, R 2 and R 3 are each independently hydrogen or lower alkyl, X is cycloalkylene, lower alkylene or piperidinediyl, Z is phenyl which may have a substituent or heterocyclic group which may have a substituent) Or a prodrug thereof, a pharmaceutically acceptable salt thereof or a solvate thereof. |