| 摘要 |
The present invention is directed to a compound of Formula I wherein R1, R2, R3, R4, R5, R6, W, X, Y, and Z are defined herein. The compounds of the present invention are useful as anticancer agents. Specifically, the compoun ds are useful for treating or preventing cancer and tumor growth. The present invention is also directed to compositions comprising a compound according t o the above formula. The present invention is also directed to methods of usin g a compound according to the above formula.
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