Disclosed are compounds of Formula (I):or a salt thereof, wherein: R1, R2, R3, R4, R5, and m are defined herein. Also disclosed are methods of using such 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.本發明揭示式(I)化合物:或其鹽,其中:R1、R2、R3、R4、R5及m在本文中定義。亦揭示使用此類化合物抑制二醯基甘油激酶α (DGKα)及二醯基甘油激酶ξ (DGKζ)中之一或兩者之活性的方法,及包含此類化合物之醫藥組合物。此等化合物可用於治療病毒感染及增殖性病症,諸如癌症。