Compound of formula (I): ** Formula ** in which R 'and R ", identical or different, represent: - either a hydrogen atom； - or a monovalent radical of formula (IIa): ** Formula ** in which: - R1 represents an aliphatic, saturated or unsaturated, linear or branched radical, which includes 7 to 30 carbon atoms, - R2 represents a hydrogen atom or a radical chosen from the methyl, isopropyl, isobutyl radicals , 1- methyl propyl, hydroxymethyl, 1-hydroxy ethyl, thiomethyl, 2-methylthio ethyl, 4-aminobutyl, 3-guanidino propyl, 3- ureido propyl, (1-amino carbonyl) methyl, carboxy methyl, 2-carboxy ethyl, 2 (amino carbonyl) ethyl, benzyl, 4-hydroxy benzyl, 3,4-dihydroxy benzyl, [1 H -indol-3-yl] methyl, (1 H -imidazol-4-yl) methyl, 3-amino propyl, and - R3 represents a hydrogen atom or a methyl radical； - or a monovalent radical of formula (IIb): ** Formula ** in which: - R1 is as defined in formula (IIa) and - R4 represents a atom of hydrogen or a hydroxy radical, it being understood that at least one of the radicals R 'or R "does not represent a hydrogen atom and that when none of the radicals R' and R" does not represent a hydrogen atom, R 'and R "They are identical.Compuesto de fórmula (I):**Fórmula** en la cual R' y R", idénticos o diferentes, representan: - bien sea un átomo de hidrógeno； - o bien un radical monovalente de fórmula (IIa):**Fórmula** en la cual: - R1 representa un radical alifático, saturado o insaturado, lineal o ramificado, que incluye de 7 a 30 átomos de carbono, - R2 representa un átomo de hidrógeno o un radical elegido entre los radicales metilo, isopropilo, isobutilo, 1- metil propilo, hidroximetilo, 1-hidroxi etilo, tiometilo, 2-metiltio etilo, 4-aminobutilo, 3-guanidino propilo, 3- uréido propilo, (1-amino carbonil) metilo, carboxi metilo, 2-carboxi etilo, 2 (amino carbonil) etilo, bencilo, 4- hidroxi bencilo, 3,4-dihidroxi bencilo, [1H-indol-3-il] metilo, (1H-imidazol-4-il) metilo, 3-amino propilo, y - R3 representa un átomo de hidrógeno o un ra
