| http://www.w3.org/ns/prov#value | - They may be chosen for the implementation of the invention from the molecules represented by the following formula (b): (XR1)???R???(R2Y)n (b) [0054] in which: [0055] n is an integer greater than or equal to 2 and preferably between 2 and 10 (limits included) and preferably equal to 2, [0056] R1 and R2 may be identical or different and represent a covalent bond or an aliphatic, arylaliphatic, arom
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