Patent ID: 7488755

Claim:
A R(+)-2-amino-3-hydroxypropanoic acid derivative of formula III, or one of its pharmaceutically acceptable salts; wherein R is hydrogen; R′ is hydrogen, or a phenyl(C 2 -C 6 )alkenyl group, or a gem-diphenyl(C 1 -C 6 )alkyl group other than benzhydryl, or a gem-diphenyl(C 2 -C 6 )alkenyl group; or R and R′, together, form a phenyl(C 1 -C 6 )alkylidene or gem-diphenyl(C 1 -C 6 )alkylidene group; R″ is hydrogen or a (C 1 -C 6 )alkyl, (C 3 -C 6 )cycloalkyl(C 1 -C 6 )alkyl, phenyl(C 1 -C 2 )alkyl or phenacetyl group; the phenyl group or groups being non-substituted or substituted by a halogen atom or by a hydroxy, (C 1 -C 3 )alkoxy, cyano, nitro or acetyl group; with the proviso that, when R and R′ are both hydrogen, then R″ is other than hydrogen, (C 1 -C 6 )alkyl or non-substituted benzyl.