Here’s an in vitro study.
https://www.researchgate.net/journal/Communications-Biology-2399-3642/publication/348626948_Identification_of_3-chymotrypsin_like_protease_3CLPro_inhibitors_as_potential_anti-SARS-CoV-2_agents/links/60091af1299bf14088adbf5e/Identification-of-3-chymotrypsin-like-protease-3CLPro-inhibitors-as-potential-anti-SARS-CoV-2-agents.pdf
Right, a test tube study, but the claim was clinical studies.
Does anyone have any of those?