3QLB:
reference: Pyochelin enantiomers and their outer-membrane siderophore transporters in fluorescent pseudomonads: structural bases for unique enantiospecific recognition., Brillet K, Reimmann C, Mislin GL, Noel S, Rognan D, Schalk IJ, Cobessi D, J Am Chem Soc. 2011 Oct 19;133(41):16503-9. Epub 2011 Sep 23. PMID: 21902256

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