Novel naphthalene derivative

摘要

Naphthalene derivative of the formula: <IMAGE> (I) wherein R1 is hydrogen atom or a lower alkoxycarbonyl and R2 is a lower alkoxycarbonyl, or R1 and R2 are combined together to form a group of the formula: <IMAGE> each of R3 and R4 is a lower alkoxy, or one of R3 and R4 is hydrogen atom and the other is a lower alkoxy, and Ring A is a substituted or unsubstituted benzene ring, and a pharmaceutically acceptable salt thereof are disclosed. Said naphthalene derivative (I) and its salt have excellent hypolipidemic activity and are useful for treatment or prophylaxis of hyperlipidemia and/or arteriosclerosis.