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Synergistic inhibition of SARS-CoV-2 cell entry by otamixaban and covalent protease inhibitors: pre-clinical assessment of pharmacological and molecular properties. Tim Hempel , Katarina Elez, Nadine Krüger, Lluís Raich, Jonathan H Shrimp, Olga Danov, Danny Jonigk , Armin Braun, Min Shen, Matthew D Hall, Stefan Pöhlmann , Markus Hoffmann , Frank Noé. Chemical science. 2021 Aug;12:12600-12609.