Patent ID: 6914075

Claim:
A cystine derivative represented by formula (I): wherein “n” and “m” independently represent an integer of 0 to 5; Ar 1 and Ar 2 independently represent a 2-hydroxyaryl group wherein the 2-hydroxyaryl group may be independently substituted with at least one substituent selected from the group consisting of: halogen atom, hydroxyl group, cyano group, nitro group, amino group, C 1 -C 20 alkyl group, C 1 -C 4 alkyl group wherein at least a part of the hydrogen atoms is substituted with fluorine atom(s), C 1 -C 6 alkoxy group, C 1 -C 6 hydroxyalkyl group, and C 1 -C 6 aminoalkyl group; R 1 and R 4 independently represent a substituent selected from the group consisting of hydrogen atom, C 1 -C 6 alkyl group, and phenyl group; X and Y independently represent O; R 2 and R 3 independently represent a substituent selected from the group consisting of hydrogen atom, C 1 -C 20 alkyl group, C 7 -C 16 aralkyl group, and C 2 -C 20 unsaturated hydrocarbon group having unsaturated carbon-carbon bond(s) within the molecule; and the two Ts independently represent hydrogen atom or C 1 -C 6 alkyl group and the two Vs independently represent hydrogen atom or C 1 -C 6 alkyl group, and wherein the cystine derivative may be in a form selected from the group consisting of a free form, a salt form and a solvate form; and additionally wherein the cystine derivative may be an optically active substance or a racemic modification.