Diphenylbutyl-piperzinecarboxamides

A compound, characterized in that it has the general formula ##STR15## wherein R.sub.1 and R.sub.2 are groups independently selected from the group of hydrogen, alkyl straight or branched chains having from 1 to 10 carbon atoms, cycloalkyl having from 3 to 8 carbon atoms, aralkyl having from 7 to 9 carbon atoms, alkenyl having from 2 to 10 carbon atoms, phenyl unsubstituted or substituted by one to three substituents selected from halogen, including F, Cl and Br, lower alkyl having from 1 to 5 carbon atoms, lower alkoxy having from 1 to 5 carbon atoms, amine unsubstituted or substituted by one or two lower alkyl groups having from 1 to 5 carbon atoms, --CF.sub.3 and --CN groups, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are groups independently selected from hydrogen, lower alkyl having from 1 to 3 carbon atoms and phenyl, R.sub.7 is a group selected from hydrogen, halogen including F, Cl and Br, lower alkoxy having from 1 to 3 carbon atoms and --CF.sub.3 groups, and X is O or S, and pharmaceutically acceptable acid addition salts thereof.