Composition for skin anti-aging, skin brightening or skin reverse-aging containing amide-based compound

A method for skin anti-aging, skin brightening, or skin reverse-aging, comprising:

• administering to a subject in need thereof an effective amount of a composition comprising, as an active ingredient, a compound represented by Chemical Formula 1, a stereoisomer thereof, a pharmaceutically acceptable salt thereof, a hydrate thereof, or a solvate thereof,
• in Chemical Formula 1,
• X is represented by any one of Chemical Formulae 1-1 to 1-5 below,
• in Chemical Formula 1-1,
• Ar is a phenyl which is unsubstituted or substituted with one to three Ri groups,
• R1 is hydrogen, phenyl group, C1-C4 alkoxy group, C1-C3 alkyl group, fluoro group, adamantyl group, acetylamino group, or hydroxyiminoethyl group, and
• when the number of R1 residues is more than one, all R1 residues are identical to each other,
• in Chemical Formula 1-2,
• Ar is a phenyl substituted with one R2, and
• R2 is C1-C4 alkyl group, C1-C4 alkoxy group, adamantyl group, acetyl group, or acetylamino group,
• in Chemical Formula 1-3,
• Ar is a phenyl substituted with one to three R3 groups or an unsubstituted naphthalene,
• R3 is hydrogen or a C1-C4 alkyl group, and
• when the number of R3 residues is more than one, all R3 residues are identical to each other, and preferably, R3 is a C1-C4 alkyl group,
• in Chemical Formula 1-4,
• Ar is a phenyl which is unsubstituted or substituted with one to three R4 groups,
• R4 is hydrogen, phenyl group, C1-C4 alkyl group, or C1-C4 alkoxy group, and
• when the number of R4 residues is more than one, all R4 residues are identical to each other, and
• in Chemical Formula 1-5,
• Ar is a phenyl substituted with one to three R5 groups,
• R5 is a C1-C4 alkyl group, and
• when the number of R5 residues is more than one, all R5 residues are identical to each other.