1ZTR:
reference: Solution structure of a protein denatured state and folding intermediate., Religa TL, Markson JS, Mayor U, Freund SM, Fersht AR, Nature. 2005 Oct 13;437(7061):1053-6. PMID: 16222301

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