3U52:
reference: Analysis of Substrate Access to Active Sites in Bacterial Multicomponent Monooxygenase Hydroxylases: X-ray Crystal Structure of Xenon-Pressurized Phenol Hydroxylase from Pseudomonas sp. OX1., McCormick MS, Lippard SJ, Biochemistry. 2011 Dec 27;50(51):11058-69. Epub 2011 Dec 2. PMID: 22136180

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