| http://www.w3.org/ns/prov#value | - Suitable aromatic radicals for Z1 and Z2 are in particular phenyl or naphthyl and phenyl or naphthyl radicals substituted, for example, by C1 -C4 alkyl, for example methyl, ethyl, n-propyl, isopropyl, n-butyl, C1 -C4 alkoxy, for example methoxy or ethoxy, halogen, for example fluorine, chlorine or bromine, carboxyl, hydroxyl or sulfo.
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