A new family of central nervous system depressants has been synthesized, applying the methodology now known as the "use of fragments". One of the drugs produced by this process was assigned the name picobencide by WHO. Being a substituted benzamide, analogues were prepared modifying the substituents of the aromatic ring. A QSAR study was carried out which led to the optimization of the series. A test to modify the pyridine ring led to a new dimerization reaction of this kind of compounds.