| abstract |
PROBLEM TO BE SOLVED: To provide a melanin production inhibitory activity and a tyrosinase activity inhibitory effect, and to have excellent effects on lightening and whitening of pigmentation, spots, freckles, liver spots, etc. after sunburn, and safety. Also provides an excellent skin external preparation. SOLUTION: A benzolactam derivative represented by the following general formula (1) is blended. Embedded image (Wherein, n is an integer of 1 to 3; R 1 is a linear or branched alkyl group or an aralkyl group; R 2 is a linear or branched alkyl group; R 3 and R 4 are , A hydrogen atom or a linear or branched alkyl group, or both together form a cycloalkyl ring with the two carbon atoms on the phenyl group.) |