Patent ID: 7314877

Claim:
A benzofuran derivative represented by formula (1): (wherein R 1 represents an alkyl group which may have a substituent or an alkenyl group which may have a substituent; each of R 2 and R 3 represents a hydrogen atom, an alkyl group, a hydroxyalkyl group, a dihydroxyalkyl group, or an alkynyl group, or R 2 and R 3 form, together with the nitrogen atom adjacent thereto, a nitrogen-containing saturated heterocyclic group which may have a substituent; and the broken line denotes the possible presence of a double bond; wherein the substituent which may be possessed by the alkyl or alkenyl group represented by R 1 is a C6-C14 aryl group or a heteroaryl group having a 5-membered or 6-membered ring containing one to three nitrogen atoms, and the aryl or heteroaryl group may be substituted by one to three members selected from the group consisting of halogen atoms, alkyl groups, and alkoxy groups; and wherein the substituent which may be possessed by the heterocyclic group formed by R 2 and R 3 is a halogen atom, alkyl group, alkoxycarbonyl group, or aralkyl group) or a salt thereof.