A potent inhibitor of LSD1 (IC50 = 0.02 µM) that less effectively inhibits MAO-A and MAO-B (IC50s = 1.38 and 0.72 µM); blocks the expression of IE genes of HSV and hCMV in mammalian cells; represses HSV primary infection in mice and blocks HSV reactivation from latency in a mouse ganglion explant model.