3NJW:
reference: High-resolution crystal structure of a lasso Peptide., Nar H, Schmid A, Puder C, Potterat O, ChemMedChem. 2010 Oct 4;5(10):1689-92. PMID: 20665759

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