摘要 |
This invention provides compounds of Formula (I), having the structure where G<SUP>1</SUP>, G<SUP>2</SUP>, G<SUP>3</SUP>, G<SUP>4</SUP>, A<SUP>1</SUP>, A<SUP>2</SUP>, Y<SUP>1</SUP>, Y<SUP>2</SUP>, L<SUP>1</SUP>, Z, e and f are defined herein, or a pharmaceutically acceptable salt thereof, which are useful for treating or preventing cancer.
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