Chloroquine is a potent inhibitor of SARS coronavirus infection and spread - NIH, 2005.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1232869/
PDF:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1232869/pdf/1743-422X-2-69.pdf
https://www.digitalspy.com/movies/a845947/robert-de-niro-the-irishman-movie-shoes-al-pacino-martin-scorsese/