Novel naphthalene derivative

摘要

Naphthalene derivative of the formula: (I) wherein Ring A is a substituted or unsubstituted benzene ring; each of R1 and R2 is a group of the formula: -OR5, -NHR5 or or either one of R1 and R2 is a lower alkoxy group and the other one is a group of the formula: -OR5, -NHR5 or each of R3 and R4 is a lower alkoxy group, or one of R3 and R4 is a lower alkoxy group and the other is a hydrogen atom; R5 is a substituted alkyl group, a heterocyclic group, a cycloalkyl group, an alkyl group of at least 5 carbon atoms or alkenyl group; and each of R6 and R7 is hydrogen atom or a lower alkyl group and salts thereof are disclosed. Said naphthalene derivative (I) and its salts have excellent hypolipidemic activity and are useful for treatment or prophylaxis of hyperlipidemia and/or arteriosclerosis.