3D62:
reference: Development of broad-spectrum halomethyl ketone inhibitors against coronavirus main protease 3CL(pro)., Bacha U, Barrila J, Gabelli SB, Kiso Y, Mario Amzel L, Freire E, Chem Biol Drug Des. 2008 Jul;72(1):34-49. PMID: 18611220

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