4IWZ:
reference: Effect of incorporating a thiophene tail in the scaffold of acetazolamide on the inhibition of human carbonic anhydrase isoforms I, II, IX and XII., Biswas S, McKenna R, Supuran CT, Bioorg Med Chem Lett. 2013 Oct 15;23(20):5646-9. doi: 10.1016/j.bmcl.2013.08.019., Epub 2013 Aug 13. PMID: 23993330

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