2PQY:
reference: The oxidase DsbA folds a protein with a nonconsecutive disulfide., Messens J, Collet JF, Van Belle K, Brosens E, Loris R, Wyns L, J Biol Chem. 2007 Oct 26;282(43):31302-7. Epub 2007 Aug 16. PMID: 17702751

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