4L5W:
reference: Structural, catalytic and stabilizing consequences of aromatic cluster variants in human carbonic anhydrase II., Boone CD, Gill S, Tu C, Silverman DN, McKenna R, Arch Biochem Biophys. 2013 Nov 1;539(1):31-7. doi: 10.1016/j.abb.2013.09.001., Epub 2013 Sep 10. PMID: 24036123

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