R-61837 is a synthetic antirhinoviral compound with significant in vitro activity. R-61837 is 10 times and 57 times more active against human rhinovirus type 9 (HRV-9) than Enviroxime and dichloroflavone (DCF), respectively, and is more active against human rhinovirus type 2 (HRV-2) were 5 times and 10 times higher respectively[1].