Benzimidazole derivatives, their production and use

Abstract From the Canadian patent

Benzimidazole derivatives of the formula (I): (SEE FIG. I), wherein the ring A is a benzene ring which may optionally contain substitution in addition to the R' group; R1 is hydrogen or an optionally substituted hydrocarbon residue; R2 is a group capable of forming an anion or a group convertible thereinto; X is a direct bond or a spacer having an atomic length of two or less between the phenylene group and the phenyl group; R' is carboxyl an ester, thereof, an amide thereof or a group capable of forming an anion or convertible to an anion; Y is -O-, -S(O)m- or -N(R4)- wherein m is an integer of 0, 1 or 2 and R4 is hydrogen or an optionally substituted alkyl group; and n is an integer of 1 …