CA9 and cancer: Therefore, this ion represents an attractive candidate for medicinal applications, such as inhibitors of therapeutically relevant enzymes like HIV Protease [31], cancer-associated Carbonic Anhydrase IX (CA-IX) [32], NO synthase [33], kinases [34], antibacterial drugs [35,36], and antimycotic agents [37], as well as a boron delivery platform for Boron Neutron Capture Therapy (BNCT) of cancer [38], modifications and labeling of DNA [39], and the development of electrochemical, photoredox, and radiochemical probes in diagnostics [24,40,41,42,43].