| http://www.w3.org/ns/prov#value | - phenyl or naphthyl which is optionally substituted by sulpho, alkyl, in particular C.sub.1 -C.sub.4 -alkyl, alkoxy, in particular C.sub.1 -C.sub.14 -alkoxy, carboxylic acid or acylamino groups and halogen atoms, such as fluorine, chlorine or bromine,
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