2110nn+1n+212345The present invention provides a cyclic derivative compound having remarkable whitening effects and a chemical structure of general formula (I) or a pharmaceutically acceptable salt thereof. In the formula: A is derived from an aromatic cyclic compound； B is hydrogen oxo (=O) amino ( NH) imino (=NH) a C C saturated or unsaturated linear or branched alkyl group an alkoxy group a monoalkylamino group or a dialkylamino group； C C and C are three adjacent carbons present in the cyclic compound； and n is a positive integer. R is hydrogen hydroxyl a saturated or unsaturated linear or branched alkyl group or an alkoxy group X and Y are selected from hydrogen hydroxyl a saturated or unsaturated linear or branched alkoxy group or an acyloxy group and one of X and Y is hydrogen. Each of R R R and R is at least one substituent independently selected from hydrogen alkyl alkoxy acyloxy acyloxymethyl oxo hydroxyl vinyl nitrile carboxaldehyde carbonitrile and aldehyde.
