The present invention concerns compounds of general formula (1) (I) wherein R1 is: a hydrogen atom, or a halogen, a straight or branched C1-C6 alkyl group or a C1-C3 fluoroalkyl group, a straight or branched C1-C6 alcoxy group, a carbamyl group, N-substituted or not by one or two, straight or branched C1-C3 alkyl groups, or a cyano group (CN) R2 is: a hydrogen atom or a straight or branched C1-C6 alkyl group, HaI1, Hal2 and Hal3 are: a halogen their addition salts and the hydrates of addition salts with pharmaceutically acceptable mineral acids or organic acids, and their enantiomer forms.
