the selection of the free base or acid addition salt thereof in preparation of the desired acid addition salt in any particular case will be apparent and fully within the capability of one skilled in the art such novel compounds of the invention are frequently used in the form of their pharmaceutically acceptable acid addition salts such as the hydrochlorides hydrobromides or the like since the salt form is usually the best form for pharmaceutical formulations innumerable other pharmaceutically acceptable acid addition salts can be prepared from the hydrochlorides or other acid addition salts via the free bases in conventional manner various toxicological and pharmacological tests were carried out on the compounds forming the object of the invention which evidenced their suitability as substances having a valuable therapeutic activity thus they have been made the object of a study concerning their affinity for serotoninergic receptors of type 5 ht 1a the 5 ht 1a binding studies were carried out in accordance with peroutka 39 s technique see peroutka s j j neurochem 47 529 540 1986 male charles river rats are stunned and decapitated the brain is removed and dissected the different cerebral areas obtained are used or preserved at minus 20 u00b0 c the hippocampus is crushed with polytron u00ae 20 seconds at 7 in 20 volumes of 50 mm tris hcl buffer ph 7 7 at 25 u00b0 c and centrifuged at 45 000 g for 10 min the residue is separated taken up in the same volume of tris buffer and incubated for 10 min at 37 u00b0 c and then again centrifuged for 10 min at 45 000 g the residue is then taken up in 100 volumes of tris hcl buffer containing 10 u03bcm of pargyline 4 mm cacl 2 and 0 1 ascorbic acid.