M435-1279（Cat No.:I045221）is a potent, selective inhibitor of hemagglutinin-neuraminidase (HN), a multifunctional viral surface glycoprotein found in certain paramyxoviruses, including human parainfluenza viruses. By blocking HN’s receptor-binding and sialidase activities, M435-1279 prevents viral attachment, entry, and release, thereby inhibiting viral replication. It is a valuable research tool for studying paramyxovirus biology, viral entry mechanisms, and host–pathogen interactions. M435-1279 holds therapeutic potential for developing antiviral agents targeting respiratory infections caused by HN-expressing viruses, offering a strategy to disrupt multiple stages of the viral life cycle.