Patent ID: 8889715

Claim:
A salt adduct comprising a positively charged moiety of formula (I): wherein R 1 is straight or branched C 1 -C 6 alkyl; R 2 is selected from —OH, straight or branched C 1 -C 6 alkoxy, and straight or branched C 1 -C 6 alkoxycarbonyl; R 3 and R 4 are each independently selected from formyl and straight or branched C 1 -C 6 alkyl optionally substituted by at least one halogen, amine, hydroxyl, C 1 -C 6 alkoxy, thiol, or C 1 -C 6 alkoxycarbonyl, and a carboxylated lactam ring is selected from the group consisting of: wherein R 6 is selected from H, straight or branched C 1 -C 6 alkyl optionally substituted at least one halogen, straight or branched C 2 -C 6 alkenyl, straight or branched C 2 -C 6 alkynyl, cycloalkyl, aryl and heteroaryl optionally substituted by a C 1 -C 6 alkyl; R 7 , R 8 , R 9 , R 10 , R 11 , R 12 , R 13 and R 14 are each independently selected from H, straight or branched C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, cycloalkyl, aryl and heteroaryl optionally substituted by at least one group selected from C 1 -C 6 alkyl, halogen, amino, cyano, nitro, thiol, C 1 -C 6 alkoxy, aminocarbonyl, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 carboxyalkyl, C 1 -C 6 alkoxycarbonylalkyl and amidino, wherein the salt adduct is not metadoxine.