BENZIMIDAZOLE DERIVATE

PCT No. PCT/JP98/01986 Sec. 371 Date Nov. 1, 1999 Sec. 102(e) Date Nov. 1, 1999 PCT Filed Apr. 30, 1998 PCT Pub. No. WO98/50368 PCT Pub. Date Nov. 12, 1998A benzimidazole derivative of the formula (I) or its salt: wherein A is a single bond or a C1-2 alkylene group (this alkylene group may optionally be substituted by a C1-4 alkyl group), R6 is a C1-4 alkyl group (this alkyl group may optionally be substituted by a phenyl group), B is a C2-3 alkylene group (this alkylene group may optionally be substituted by a C1-4 alkyl group), X is an oxygen atom, a sulfur atom or NR7 (wherein R7 is a nitro group, a cyano group or a C1-4 alkoxy group), each of R1 and R2 which are independent of each other, is a hydrogen atom, a halogen atom, a C1-4 alkyl group or a C1-4 alkoxy group, E is a C1-2 alkylene group (this alkylene group may optionally be substituted by a C1-4 alkyl group), R3 is a phenyl group (this phenyl group may optionally be substituted by a halogen atom, a C1-4 alkyl group or a C1-4 alkoxy group), a C1-4 alkoxy group or a benzyloxy group, each of R4 and R5 which are independent of each other, is a C1-4 alkyl group (this alkyl group may optionally be substituted by a phenyl group), D is a C1-2 alkylene group (this alkylene group may optionally be substituted by a C1-4 alkyl group), and Ar is a phenyl group.