Patent ID: 8198468

Claim:
A salt of a carboxylic acid with an aminoketone of the formula; wherein R 1 is 2-thienyl or 2-furanyl, each optionally substituted with one or more halogen and/or one or more C 1-4 -alkyl or C 1-4 -alkoxy, and wherein R 2 is C 1-4 -alkyl or phenyl, each optionally substituted with one or more halogen and/or one or more C 1-4 -alkyl or C 1-4 -alkoxy wherein the carboxylic acid is selected from the group consisting of C 1-18 -alkanoic acids, (−)-2,3:4,6-di-O-isopropyl-idene-2-keto-L-gulonic acid, (+)-2,3:4,6-di-O-isopropylidene-2-keto-D-gulonic acid, 2-keto-L-gulonic acid, 2-keto-D-gulonic acid, L-aspartic acid, D-aspartic acid, DL-aspartic acid, benzoic acid, 3-methyl-benzoic acid, salicylic acid and 1-naphthanelenecarboxylic acid and 2-naphthalenecarboxylic acid.