Derivatives of 4,4′-dithiobis-(3-aminobutane-1-sulfonates) and compositions comprising the same

Compound characterized in that it corresponds to formula (1)

• in which
• each group R1 is identical to the other group R1 and represents:
• a C1 to C6 alkyl, C2 to C6 alkenyl or C2 to C6 alkynyl group,
• a (CH2)nbenzyl group in which n is equal to 0 or 1,
• a (CH2)m(C3 to C6 cycloalkyl) group in which m is equal to 0 or 1,
• each of the alkyl, alkenyl, alkynyl, benzyl or cycloalkyl groups being substituted with one or two group(s) represented by the group A;
• the group A represents:
• a carboxylate group COOH or COOR, R representing a C1 to C6 alkyl or CH2phenyl group;
• a sulfonate group SO3H or SO3R′, R′ representing a C1 to C6 alkyl or CH2phenyl group;
• a phosphonate group PO3H2 or PO3R2″R′″, R″ and R′″ independently representing H, or a C1 to C6 alkyl or CH2phenyl group;
• each group R2 is identical to the other group R2 and represents a C1 to C6 alkyl, C2 to C6 alkenyl or C2 to C6 alkynyl group, each alkyl, alkenyl or alkynyl group being free or substituted with the group B;
• the group B represents:
• a carboxylate group, COOH or COOR′, R′ representing a C1 to C6 alkyl or CH2phenyl group;
• a phenyl group that is free or substituted with one or more radicals chosen from a halogen atom, an optionally protected hydroxyl radical, a C1 to C4 alkyl group, a cyano group, a free, salified or esterified carboxyl group or an amide group;
• each group R3 is identical to the other group R3 and represents a hydrogen atom.