A telomerase inhibitor (IC50 = 0.67 μM in a TRAP assay); selective for telomerase over DNA polymerase (3 μM); inhibits growth of U937 cells (GI50 = 1.7 μM); reduces cell number and expression of the proliferation marker MIB-1 as well as increases DNA damage in primary pediatric ependymoma tumor cells; decreases survival of H460 and H1299 NSCLC cells; reduces tumor size by 70% in an H460 mouse xenograft model (40 mg/kg); inhibits replication of HSV-2 and a clinical isolate of HSV-1; decreases accumulation of early and late viral proteins in HEp-2 cells infected with HSV-1