| abstract |
The disclosure relates to Compounds of Formula (1) : n n n n n n n n n n and pharmaceutically acceptable salts thereof wherein Z 1 , Z 2 , Z 3 , Xa, Xb, Xc, Y, X 2 , and X 4 are as defined herein, compositions comprising an effective amount of a Compound of Formula (1) or a pharmaceutically acceptable salt thereof, and methods to treat or prevent a condition, such as cancer which overexpresses Her-kinases, comprising administering to an patient in need thereof a therapeutically effective amount of a Compound of Formula (1) or a pharmaceutically acceptable salt thereof. |