| 摘要 |
A compound represented by the formula (I): 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, R<B >and R<C >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, their pharmaceutically acceptable salts, or their solvates.
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