5Y2Y:
reference: Structure-guided synthesis of a protein-based fluorescent sensor for alkyl halides., Kang MG, Lee H, Kim BH, Dunbayev Y, Seo JK, Lee C, Rhee HW, Chem Commun (Camb). 2017 Aug 15;53(66):9226-9229. doi: 10.1039/c7cc03714g. PMID: 28766590

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