The present invention provides, at least in part, compounds of formula (I): or a pharmaceutically acceptable salt thereof, wherein Z1, Z2, Z3, R1, x, y, R2, R3, R4a, R4b, R5, R6 and R7 are described herein, as well as methods for their identification, their preparation, pharmaceutical compositions containing them, and their use as Aurora A kinase inhibitors in treatment, e.g., of cancer and other proliferative disorders.
