4E5Q:
reference: Human carbonic anhydrase II-cyanate inhibitor complex: putting the debate to rest., West D, Pinard MA, Tu C, Silverman DN, McKenna R, Acta Crystallogr F Struct Biol Commun. 2014 Oct 1;70(Pt 10):1324-7. doi:, 10.1107/S2053230X14018135. Epub 2014 Sep 25. PMID: 25286933

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