3SNE:
reference: Peptide aldehyde inhibitors challenge the substrate specificity of the SARS-coronavirus main protease., Zhu L, George S, Schmidt MF, Al-Gharabli SI, Rademann J, Hilgenfeld R, Antiviral Res. 2011 Aug 11. PMID: 21854807

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