| 摘要 |
The invention provides compounds of formula I: wherein A, B, W, Y, Z, and R<SUB>1 </SUB>have any of the meanings defined in the specification and their pharmaceutically acceptable salts. The invention also provides pharmaceutical compositions comprising a compound of formula I, processes for preparing compounds of formula I, intermediates useful for preparing compounds of formula I, and therapeutic methods for treating cancer using compounds of formula I.
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