5TG1:
reference: Design, synthesis, and evaluation of a novel series of macrocyclic inhibitors of norovirus 3CL protease., Damalanka VC, Kim Y, Galasiti Kankanamalage AC, Lushington GH, Mehzabeen N, Battaile KP, Lovell S, Chang KO, Groutas WC, Eur J Med Chem. 2016 Dec 21;127:41-61. doi: 10.1016/j.ejmech.2016.12.033. PMID: 28038326

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