This invention provides compounds of Formula (I), having the structure ##STR00001## where G.sup.1, G.sup.2, G.sup.3, G.sup.4, A.sup.1, A.sup.2, Y.sup.1, Y.sup.2, L.sup.1, 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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