| abstract |
A compound of formula (I) or a salt thereof is disclosed, wherein R 1 , R 2 , R 3 , and R 4 are defined herein. Also disclosed are methods of using these compounds to inhibit the activity of one or both of diacylglycerol kinase alpha (DGKα) and diacylglycerol kinase zeta (DGKζ) and pharmaceutical compositions comprising such compounds. These compounds are useful in the treatment of viral infections and proliferative disorders such as cancer. |