| abstract |
A method for scavenging free radicals and inhibiting tyrosinase and melanin is provided. The method includes administering to a subject of effective amounts in a pharmaceutical composition comprising a compound of Formula (I) or (II) and a pharmaceutical acceptable salt, metal salt or solvent. n n n n n n n n n n In Formula (II), R is C1-6 alkyl, vitamin C or sugar. X is chlorine, bromine or iodine. The subject is a human. The pharmaceutical composition is for external and internal use. |