Highly specific inhibitor of lysine specific demethylase 1 (LSD1, also known as KDM1A, or H3K9 demethylase) (IC50, ~0.02 µM). OG-L002 potently repressed herpes simplex virus (HSV) IE gene expression, genome replication, and reactivation from latency. It suppressed primary lytic infection of HSV in vivo in a mouse model. This highlights the potential for drugs that inhibit a virus’ ability to modify chromatin for treating or even preventing viral diseases like herpes, chicken pox, and shingles.