N-desethyl Brinzolamide is an active metabolite of the carbonic anhydrase (CA) inhibitor brinzolamide .1It inhibits CAII and CAIV activities (IC50s = 1.28 and 128 nM, respectively). 1.Kim, C.-Y., Whittington, D.A., Chang, J.S., et al.Structural aspects of isozyme selectivity in the binding of inhibitors to carbonic anhydrases II and IVJ. Med. Chem.45(4)888-893(2002)