4-Methoxycinnamaldehyde

4-Methoxycinnamaldehyde (CAS No.: 1963-36-6) is a naturally occurring phenylpropanoid aldehyde and a bioactive constituent isolated from Agastache rugosa, widely utilized in biochemical and pharmacological research as a small-molecule probe for antiviral and cytoprotective studies. This compound has been reported to exhibit inhibitory activity against respiratory syncytial virus (RSV) in human laryngeal carcinoma cell models, where it attenuates virus-induced cytopathic effects with potency in the sub-microgram per milliliter range, corresponding to low micromolar to submicromolar activity levels. Mechanistic investigations suggest that its biological effects may involve modulation of virus-host interactions and interference with cellular pathways associated with oxidative stress responses and viral replication processes, although precise molecular targets remain to be fully elucidated. Due to its well-defined in vitro activity profile, 4-methoxycinnamaldehyde is commonly applied in antiviral screening assays, mechanistic studies of host cell protection, and exploratory drug discovery programs focusing on natural product-derived scaffolds. Experimental usage typically involves concentration ranges tailored to specific cellular systems and assay conditions, supporting its role as a reference compound in studies of virus-induced cytopathology and cellular defense mechanisms.