| http://www.w3.org/ns/prov#value | - (3), ##STR19## wherein M is a hydrogen atom, Cu, Fe, Co or Ni; A is a phenylene group or a straight-chain or branched alkylene group having 1 or more carbon atoms, M+ is a cation selected from the group consisting of alkali metal cation, quaternary ammonium cation, quaternary phosphonium cation, and alkanolamine cation, and q is an integer of 0 to 4, and r is an integer of 0 to 8, provided that q
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