| http://www.w3.org/ns/prov#value | - wherein M is a hydrogen atom, a metallic atom, or a quaternary ammonium; Z is a nitrogen-containing heterocycle, and n is an integer of 0-5; and R1 is a hydrogen atom, a halogen atom, an alkyl group, an aryl group, an alkylcarbonamide group, an arylcarbonamide group, an alkylsulfonamide group, an arylsulfonamide group, an alkoxy group, an aryloxy group, an alkylthio group, an arylthio group, an al
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