2ALV:
reference: Design and synthesis of peptidomimetic severe acute respiratory syndrome chymotrypsin-like protease inhibitors., Ghosh AK, Xi K, Ratia K, Santarsiero BD, Fu W, Harcourt BH, Rota PA, Baker SC, Johnson ME, Mesecar AD, J Med Chem. 2005 Nov 3;48(22):6767-71. PMID: 16250632

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