| abstract |
Compounds of formula (I) and their pharmaceutically acceptable salts. Symbols used in formula (I) and included in this specification will have the following meanings: R1 and R2 are independently hydrogen, fluorine or alkyl; R3 is aryl or heteroaryl. Compounds of formula (I) are protein kinase inhibitors and are useful in the treatment and prevention of proliferative diseases such as cancer, inflammation and arteritis. Formula (I). |