The present invention discloses tetracyclic xanthene derivatives of Formula (I) and pharmaceutically acceptable salts thereof, wherein A, Y1, Y2, Z, Ra, Rb, R1a, R1b, and R2 are as defined herein. The present invention also discloses compositions comprising at least one tetracyclic xanthene derivative, and methods of using the tetracyclic xanthene derivatives for treating or preventing HCV infection in a patient.
本发明公开了式(I)的四环
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生物及其药用盐,其中A、Y1、Y2、Z、Ra、Rb、R1a、R1b和R2如本文所定义。本发明还公开了包含至少一种四环
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生物的组合物,以及利用四环
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生物治疗或预防患者HCV感染的方法。