Abstract: .omega.-Dialkylalkanoic acid derivatives of the formula: ##STR1## in which R.sub.1 and R.sub.2, which can be the same or different, each represent an alkyl radical having from 1 to 4 carbon atoms and n represents 0, 1, 2 or 3.They possess a competitive inhibitory activity with respect to .gamma.-aminobutyric .alpha.-ketoglutaric transaminase as well as antianoxic and anticonvulsant properties and they are useful for treating central neurological disorders, whether resulting or not from cerebral ischemia, and disorders relating to the field of neuropsychiatry.

Abstract: Urea derivatives of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3, which are the same or different, each represent a straight- or branched-chain alkyl, alkenyl or alkynyl radical having from 1 to 5 carbon atoms, R.sub.4 and R.sub.5, which are the same or different, each represent a hydrogen atom or a straight- or branched-chain alkyl, alkenyl or alkynyl radical having from 1 to 5 carbon atoms, R.sub.1, R.sub.2 and R.sub.3 being such that:(a) only one of these radicals can represent an alkenyl or alkynyl group having an unsaturated bond in the .alpha.,.beta.-position with respect to the methylurea radical, in this case, each of the other two substituents represents an alkyl radical,(b) the sum of their carbon atoms is never inferior to 4.They are useful as anxiolytic and antiagressive agents.