3TJS:
reference: Interaction of human cytochrome P4503A4 with ritonavir analogs., Sevrioukova IF, Poulos TL, Arch Biochem Biophys. 2012 Apr 15;520(2):108-16. Epub 2012 Mar 5. PMID: 22410611

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