Benzimidazole compounds

A benzimidazole compound represented by the following formula (I) or a salt thereof:

• wherein, R1 represents one or more functional groups on the benzene ring selected from the group consisting of hydrogen atom, a halogen atom, a lower alkyl group, and a lower alkoxy group;
• R2 represents hydrogen atom, an alkyl group, or an acyl group;
• L represents a C4-C8 alkylene group, or an ethyleneoxy bridging group represented as (CH2CH2O)nCH2CH2 wherein n represents 1 or 2;
• X represents O or NH wherein NH may have a functional group on the nitrogen atom;
• Y represents S or a single bond;
• Q is a residue of a heterocyclic ring selected from the group consisting of pyridine, pyrimidine, pyrazine, triazine, pyrrole, thiophene, furan, imidazole, pyrazole, triazole, tetrazole, thiazole, thiadiazole, oxazole, oxadiazole, benzimidazole, benzoxazole, and benzothiazole;
• and X binds to a carbon atom contained in Q.