AG-13958 monohydrochloride is the HCl salt of AG-13958 --- a VEGFA inhibitor potentially for the treatment of age-related macular degeneration. Neovascular AMD, a subtype characterized by the growth of new, pathologic blood vessels, results in most of the cases of severe and rapid vision loss associated with AMD. A critical activator of angiogenesis in neovascular AMD is VEGF.