A comparative look at where drug molecules bind to the main protease of Covid-19 depicted by interactive raytracing in the UnityMol software. The visualization is inspired by the animation of small molecules in 92 protein databank structures (<a href="https://www.rbvi.ucsf.edu/chimerax/data/sars-protease-may2020/">https://www.rbvi.ucsf.edu/chimerax/data/sars-protease-may2020/</a>) prepared by the ChimeraX team.