| abstract |
A compound of formula (IIIa), Wherein R 1 , R 2 , R 3 , X 1 , X 2 , X 3 , X 4 , X 5 are defined and therefore have any of the values herein, and pharmaceutically acceptable Their salts are disclosed. The compounds can be used as drugs for the treatment of diseases including cancer. Also provided are pharmaceutical compositions comprising one or more compounds of formula (IIIa). |