Complex form of at least one 5- (1,2-dihydroxyethyl) -3,4-dihydroxy-5H-furan-2-one molecule or derivative covalently linked to at least one hydrocarbon radical of formula (A) ) as follows: wherein: - mi = 1, 2, 3, 4, 5 or 6； m 2 = 0, 1, 2, 3, 4, 5 or 6； and represents the binding site to the 5- (1,2-dihydroxyethyl) -3,4-dihydroxy-5H-furan-2-one molecule or derivative. Formula (I)Complexe forme d'au moins une molecule de 5-(l,2-dihydroxy-ethyl) -3,4-dihydroxy-5H-furan-2-one ou derive liee de maniere covalente a au moins un radical hydrocarbone de formule (A) comme suit : dans laquelle : - m i = 1, 2, 3, 4, 5 ou 6； - m 2 = 0, 1, 2, 3, 4, 5 ou 6； et represente le site de liaison a la molecule de 5-(l,2-dihydroxy-ethyl) -3,4-dihydroxy-5H-furan-2-one ou derive. Formule (I)
