| 摘要 |
A compound represented by the formula (I):wherein, for example, R1, R2, R3, and R4 are each independently hydrogen atom, alky, and the like, R5 and R6 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.
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