Inhibitor of protein kinase C (IC50 = 2.45 μM) that displays ~ 10-fold selectivity over protein kinase A (IC50 = 25.7 μM). Also inhibits β-lactamase, malate dehydrogenase and chymotrypsin (IC50 values are 8, 8 and 10 μM respectively). Exhibits antiviral activity against GCV-sensitive and -resistant strains of human cytomegalovirus (HCMV) (IC50 values range from 0.13 - 0.32 μM). Shows no activity against herpes simplex virus (HSV).