| abstract |
Disclosed are compounds of Formula (IIIa), wherein R 1 , R 2 , R 3 , X 1 , X 2 , X 3 , X 4 , X 5 , have any of the values defined therefore in the specification, and pharmaceutically acceptable salts thereof. The compounds may be used as agents in the treatment of diseases, including cancer. Also provided are pharmaceutical compositions comprising one or more compounds of Formula (IIIa). |