| abstract |
(57) [Summary]n The present invention relates to carboxylic acids and isosteres of heterocyclic ring compounds having various (eg, one or more) heteroatoms in the heterocyclic ring, and diketo, sulfonamides N-linked thereto. , Urea and their derivatives with carbamic acid relate to the surprising discovery that they can be useful for treating visual impairment in animals, or improving vision, or treating memory impairment, or enhancing memory behavior . Accordingly, carboxylic acids and isosteres of heterocyclic ring compounds having various (eg, one or more) heteroatoms in the heterocyclic ring and diketo, sulfonamide, urea N-bonded thereto Novel compositions and methods are provided that utilize the compounds and derivatives thereof having carbamic acid. A preferred feature of the compounds according to the invention is that they do not have any significant immunosuppressive activity. |