| abstract |
The present invention relates to novel heterocyclic compounds having general formula (1) wherein: X is O, S, Se, or NR2; Y1, Y2, Y3, Y4 independently are N or CR2; Z is O, S, Se, NR2 or C = N; and A is (a) or (b) wherein W is O, S, NH or N-lower alkyl, with the proviso that at lest one of X, Y1, Y2, Y3 or Y4 is nitrogen and that the ring (c) is not 1-methyl-2-imidazolyl; geometric and optical isomers and racemates thereof where such isomers exist, as well as pharmaceutically acceptable acid addition salts thereof and solvates thereof; having therapeutic activity, processes and intermediates for their preparation, pharmaceutical formulations containing said compounds and the medicinal use of said compounds. |