prov:value
| - Substituents here of the phenylene and napthylene radicals mentioned are, for example, C1 -C4 alkyl, C1 -C4 alkoxy, C2 -C4 alkanoylamino, amino, hydroxyl, ureido, halogen, carboxyl or sulfo, in particular C1 -C4 alkyl, C1 -C4 alkoxy, halogen or sulfo.
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