Cysteine compounds represented by the following formula
wherein each symbol is as defined in the specification, and salts thereof, are superior in stability, have less odor, exhibit an eumelanin production suppressive effect, and are useful as cosmetic agents.
                            以下公式所代表的半胱
氨酸化合物,其中每个符号如规范中定义,并其盐,具有更好的稳定性,气味较轻,表现出对
黑色素产生抑制作用,并可用作化妆品剂。