Benzofuran derivative and skin care preparation for external use containing the same

摘要: PROBLEM TO BE SOLVED: To obtain a new bleaching material, and to provide skin care preparation for external use using the same that not only exerts excellent effects on preventing ameliorating dyspigmentation but also is free from any concern about safety therefore usable safely. SOLUTION: A benzofuran derivative provided, being represented by formula(I)( wherein, R 1 2 are each H, OH or 1-4C alkyloxy, bound other form an alkylenedioxy group with carbon chain number of 1-2; 3 , 4 5 alkyl 2-4C alkenyl, bonds broken lines may be present absent ). The contains this derivative, applicable as e.g. cosmetic bleaching. COPYRIGHT: (C)2006,JPO&NCIPI