| abstract |
Compounds of Formula I wherein R 1 and R 2 are the same or differently H or C 1 -C 6 linear or branched alkyl; R 3 is C 1 -C 6 linear or branched alkyl; R 4 is halogen ) And pharmaceutically acceptable salts thereof are useful for the preparation of a medicament used as ligand of the 5-HT 6 and / or 5-HT 7 serotonergic receptors as active ingredients. n n n 5-HT6, 5-HT7 serotonergic receptor |