| abstract |
This invention relates to compounds of general formula (I) n n n n n n n n n n n n in which R 1 , R 2 , R 3 , R 4 , L, X and Z are as defined herein, and the pharmaceutically acceptable salts thereof, to pharmaceutical compositions comprising such compounds and salts, and to methods of using such compounds, salts and compositions for the treatment of abnormal cell growth, including cancer. |