4FL7:
reference: Hydroxamate represents a versatile zinc binding group for the development of new carbonic anhydrase inhibitors., Di Fiore A, Maresca A, Supuran CT, De Simone G, Chem Commun (Camb). 2012 Sep 11;48(70):8838-40. Epub 2012 Jul 27. PMID: 22836518

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