| http://www.w3.org/ns/prov#value | - group, R4 and R5 in number n may be the same or different and each is a hydrogen atom or a lower alkyl group, R6 is an optionally substituted amino group or a nitrogen-containing heterocyclic group, or an ammonio group, and n is an integer of 0-6. [0023] In the above-mentioned formula (I), each symbol means the following unless otherwise specifically indicated. [0024] The halogen atom means a fluo
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