nds useful according to the disclosure may be chosen from compounds of the general formula (VI): ??? CH2 I CHOH I N??? CH2 I wherein, in formula (VI): -Rii and R12 are, independently, chosen from alkyf or alkenyl groups with 10 to 22 carbon atoms, -Ri3 is an alkyl or hydroxyl alkyl group with 1 to 4 carbon atoms, and -n is a number ranging from 1 to 6, such as, for example, 2 or 3. [00253] In at l