prov:value
| - A substituted or unsubstituted aryl radical R4 can be in particular a phenyl or naphthyl radical which can be substituted by C1 -C4 -alkyl, for example methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec.-butyl or tert.-butyl, C1 -C4 -alkoxy, such as methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec.-butoxy or tert.-butoxy, halogen, for example fluorine, chlorine or bromine, C2 -C5 -
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