Patent ID: 7612108

Claim:
A compound represented by the following general formula (I) or a salt thereof: wherein the symbols have the following meanings: R 1 : —CO 2 H, —CO 2 -lower alkyl, or a tetrazolyl group, R 2 : H, halogen, lower alkyl, or —O-lower alkyl, R 3 : H, lower alkyl, or halogen, R 4 : —CN, —NO 2 , —Br, halogeno-lower alkyl, or —(CO)-lower alkyl, R 5 : H, lower alkyl, —O-lower alkyl, halogen, —NO 2 , or —CN, X: —O—, —N(R 7 )—, or —S—, wherein the group represented by R 4 is bonded to the phenyl group at the meta- or para- position relative to the thienyl group and the group represented by —X—R 6 is bonded to the phenyl group at the meta- or para- position relative to the thienyl group, R 7 : H or lower alkyl, R 6 : linear or branched alkyl having 1 to 8 carbon atoms, linear or branched alkenyl having 3 to 8 carbon atoms, —Y-(cycloalkyl which may contain an oxygen atom), —Y-phenyl, or —Y-heteroaryl, where the linear or branched alkyl having 1 to 8 carbon atoms, linear or branched alkenyl having 3 to 8 carbon atoms, cycloalkyl which may contain an oxygen atom, phenyl, and heteroaryl may be substituted with a group selected from the group consisting of hydroxy, —CN, —O-lower alkyl, —S-lower alkyl, —NR 9 (R 9 ), and —(CO)NR 9 (R 9 ), Y: a bond, lower alkylene, or lower alkenylene, R 8 and R 9 : the same or different from each other, H or lower alkyl, where, when X is a group represented by —N(R 7 )—, R 7 and R 6 may be combined together with the nitrogen atom to form a nitrogen-containing saturated heterocycle and the nitrogen-containing saturated heterocycle may be substituted with an lower alkyl.