5TZO:
reference: Computational design of environmental sensors for the potent opioid fentanyl., Bick MJ, Greisen PJ, Morey KJ, Antunes MS, La D, Sankaran B, Reymond L, Johnsson K, Medford JI, Baker D, Elife. 2017 Sep 19;6. pii: e28909. doi: 10.7554/eLife.28909. PMID: 28925919

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