The present invention provides compounds of Formula I (wherein R
1
, R
3
, X, W, Z and ring Y are as defined herein). The present invention also provides compositions comprising these compounds that are useful for treating cellular proliferative diseases or disorders associated with KSP kinesin activity and for inhibiting KSP kinesin activity.
The invention provides pyrimidine compounds having formula A. The pyrimidine compounds of the invention are capable of inhibiting kinases, such as members of the Src kinase family, and various other specific receptor and non-receptor kinases.