| abstract |
Provided are a compound represented by Formula (I): [Formula 1] wherein R1, R2, R3, and R4 are each independently selected from a hydrogen atom, a C1-6 alkyl group which may be substituted, a c7-14 aralkyl group which may be substituted and -C(=O)Rx; n denotes an integer selected from 1 and 2; and ring Ar is selected from the groups represented by the following Formula (a) to (f). [Formula 2] , or a prodrug thereof or a pharmaceutically acceptable salt thereof as well as a medicinal drug and a pharmaceutical composition containing such a compound or a prodrug thereof, or a pharmaceutically acceptable salt thereof. |