hCAII-IN-3 (Compound 16) is an inhibitor of human carbonic anhydrase (hCA). It exhibits high affinity for hCA I, hCA II, hCA IX, and hCA XII, with Ki values of 403.8 nM, 5.1 nM, 10.2 nM, and 5.2 nM, respectively. Notably, hCA IX-IN-2 demonstrates anticancer activity [1].