| http://www.w3.org/ns/prov#value | - In the above general formula (3), Ar4, Ar5 and Ar6 may be the same or different and represent a substituted or non-substituted aryl group; and X- represents an acid anion; provided that at least one of said three aryl groups is a group expressed by the general formula, ##STR14## wherein Z represents ##STR15## R8, R9, R10 and R11 may be the same or different and represent hydrogen atom, aliphatic h
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