1-Ar1-Y2-R1" and has a cationic N atom in the ring; Y1 and Y2 independently represent 1) a single bond, 2) a heteroatom-containing group selected from the group consisting of -NR2, -CO-, -NR2CO-, -CONR2-, -NR2CONR3-, -NR2SO2-, -SO2NR2-, -NR2SO2NR3- (where R2 and R3 independently represent a hydrogen or a lower alkly), -O-, -S-, -SO- and -SO2-, or 3) a lower alkylene or lower alkenylene group which may be bound through a heteroatom-containing group as listed in the item 2); Ar1 represents a single bond, a carbocyclic group which may be substituted or a haterocyclic group which may be substituted; R1 represents -CONHCN, -C(OH)=NCN or -COOH or a biologically equivalent acidic group thereof; and the wavy line means a cis, trans or a mixture thereof.">
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