6CXU:
reference: Inhibition Mechanisms of Human Indoleamine 2,3 Dioxygenase 1., Lewis-Ballester A, Karkashon S, Batabyal D, Poulos TL, Yeh SR, J Am Chem Soc. 2018 Jun 13. doi: 10.1021/jacs.8b03691. PMID: 29897749

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