In humans, there are twelve carbonic anhydrase (CA) isozymes that possess catalytic activity for the reversible hydration of carbon dioxide. Carbonic anhydrases (CAs) underpin crucial physiological and pathological processes and are thus pharmaceutical targets for a variety of diseases, including glaucoma (CAII). Aromatic sulfonamides are the classical small molecule CA inhibitors and act through coordination of the sulfonamide anion (Ar-SO2NH-) to the active site zinc cation, replacing the zinc-bound hydroxyl anion, thereby impeding the endogenous reaction.