XK and influenza: The extract’s impressive IC50 value (4.35 μg/mL) was shown to be able to efficiently inhibit this virus strain, extending earlier findings that aqueous extracts containing a number of phenylpropanoid-derived compounds (e.g., GA (1), vanillic acid, and resveratrol) are promising sources of natural anti-influenza agents targeting NA and HA [9,10,11,55,65,68,69,84].