Derivatives of 1,2,5,6-tetrahydropyridin-3-carboxaldehyde oxime

A compound of formula I ##STR8## in which:

• R represents hydrogen, a linear, branched or cyclic alkyl, alkenyl or alkynyl containing up to 8 carbon atoms, and R' and R" are identical or different from each other, and represent a hydrogen, a linear, branched or cyclic alkyl, alkenyl or alkynyl containing up to 8 carbon atoms, or form together with the nitrogen to which they are linked a heterocyclic radical selected from the group consisting of piperidinyl, piperazinyl, N-methyl piperazinyl and morpholinyl, said morpholinyl being optionally substituted by an alkyl radical containing up to 4 carbon atoms.