"Numerous organic molecules are known to inhibit the main protease of SARS-CoV-2, (SC2Mpro), a key component in viral replication of the 2019 novel coronavirus."
https://pubmed.ncbi.nlm.nih.gov/34396374/
"What this screenshot demonstrates is that Pfizer’s new twice-daily pill for Covid utilizes an unknown protease inhibitor"
https://citizenfreepress.com/breaking/pfizers-new-pill-to-fight-covid-utilizes-a-protease-inhibitor-ivermectin-is-also-a-protease-inhibitor/
"Structural data on the SARS-CoV-2 main protease in complex with a zinc-containing organic inhibitor are already present in the literature"
https://flore.unifi.it/handle/2158/1241843?mode=full.2166#.YTein5IpA0M
Zinc inhibits SARS-CoV-2’s main protease in vitro
https://www.news-medical.net/news/20210621/Zinc-inhibits-SARS-CoV-2e28099s-main-protease-in-vitro.aspx
Zinc2+ ion inhibits SARS-CoV-2 main protease and viral replication in vitro
https://www.biorxiv.org/content/10.1101/2021.06.15.448551v2