6WX4:
reference: Activity profiling and structures of inhibitor-bound SARS-CoV-2-PLpro protease provides a framework for anti-COVID-19 drug design., Rut W, Lv Z, Zmudzinski M, Patchett S, Nayak D, Snipas SJ, El Oualid F, Huang TT, Bekes M, Drag M, Olsen SK, bioRxiv. 2020 Apr 29. doi: 10.1101/2020.04.29.068890. PMID: 32511411

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).