4G0C:
reference: Neutron Diffraction of Acetazolamide-Bound Human Carbonic Anhydrase II Reveals Atomic Details of Drug Binding., Fisher SZ, Aggarwal M, Kovalevsky AY, Silverman DN, McKenna R, J Am Chem Soc. 2012 Sep 12;134(36):14726-9. Epub 2012 Sep 4. PMID: 22928733

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