PIGMENTATION-PREVENTING OR -AMELIORATING AGENT

摘要

Disclosed are: a pigmentation-preventing or -ameliorating agent having a novel base structure; and an external preparation for skin, which comprises the component. Specifically disclosed are: a pigmentation-preventing or -ameliorating agent comprising a compound represented by general formula (1) or an isomer and/or a pharmacologically acceptable salt thereof; and an external preparation for skin, which comprises the component. [In the formula, R1 represents a hydrogen atom, or a linear or branched alkyl group having 1 to 8 carbon atoms; R2 represents a hydrogen atom, or an aliphatic hydrocarbon group having 1 to 8 carbon atoms, an aromatic group having 5 to 12 carbon atoms, a polycyclic fused aromatic group or a heterocyclic group which is unsubstituted or has a substituent; R3 represents an aromatic group having 5 to 15 carbon atoms, a polycyclic fused aromatic group or a heterocyclic group which is unsubstituted or has a substituent; n represents an integer of 1 or 2; and m represents an integer of 0 to 3.]