PIGMENTATION-AMELIORATING AGENT

摘要

Disclosed are: a pigmentation-ameliorating agent having a novel mother nucleus; and an external preparation for the skin, which comprises the pigmentation-ameliorating agent. Specifically disclosed are: a pigmentation-ameliorating agent comprising a compound represented by general formula (1) and/or a pharmacologically acceptable salt thereof, which has an excellent pigmentation-ameliorating activity; and an external preparation for the skin, which can be used for skin whitening purposes and comprises the pigmentation-ameliorating agent. (In the formula, R1 represents a linear or branched alkyl group having 1 to 6 carbon atoms; R2 represents a hydrogen atom, or a linear or branched alkyl group having 1 to 4 carbon atoms.)