| 摘要 |
A compound represented by the formula (I) : <CHEM> wherein, for example, R<1>, R<2>, R<3>, and R<4> are each independently hydrogen atom, alkyl, and the like, R<5> and R<6> are each independently hydrogen atom, alkyl, and the like, X is -O-, -S-, and the like, Y is 5- membered heteroaryl-diyl and the like, Z is optionally substituted aryl and the like, the prodrugs thereof, or their pharmaceutically acceptable salts, or their solvates. |
