| abstract |
AND THE SALTS THEREOF WITH PHARMACEUTICALLY ACCEPTABLE CATIONS WHEREIN N AND M ARE EACH TWO OR THREE; X is oxygen or sulphur; R2 and R3, when taken separately, are each hydrogen or alkyl having 1 to 4 carbon atoms; R2 and R3, when taken together, are alkylene having 2 to 4 carbon atoms; Y is methylene or a single bond; R4 and R5, when taken separately, are each hydrogen, hydroxy or alkoxy having 1 to 5 carbon atoms, and R4 and R5, when taken together, are oxo or alkylene dioxy having 2 to 4 carbon atoms, each oxygen atom in R4 and R5, when taken separately, and in R4 and R5, when taken together, being separated from the nitrogen atom of the heterocyclic ring by two or more carbon atoms, said compounds being cerebral vasodilators. AND Compounds of the formulae: |