O-Desmethyl Brinzolamide-D5 is a labelled analogue of O-Desmethyl Brinzolamide (B677610). O-Desmethyl Brinzolamide is a derivative of Brinzolamide (B677601), a carbonic anhydrase inhibitor that is used as an ocular topical treatment for patients experiencing intraocular pressure. Brinzolamide reduces pressure by reducing the rate of aqueous humour formation.