Yu et al. used network pharmacology and molecular docking technology to explore the blocking of Mongolian medicine Forsythia and honeysuckle (main components forsythin and CGA) on the binding of S-protein of COVID-19 to angiotensin-converting enzyme 2 (ACE2) in humans effect, the two active substances bind to Gln325/Glu329 and Gln42/Asp38 of ACE2 in the form of hydrogen bonds. Here, ACE2 is linked to COVID-19.