A CDK7 inhibitor (IC50 = 50s = >10, >10, and 1.71 μM); inhibits CDK2 and CDK1 (IC50s = 6.4 and 53.7 nM, respectively); induces apoptosis in A549, HeLa, and HCT116 cancer cells from 10-100 nM; inhibits HCMV replication in human fibroblasts (EC50 = 24.5 nM); reduces replication of various viruses (EC50s = 0.02-1.13 μM)