prov:value
| - A substituted or unsubstituted aryl radical R2, R3 or R5 can be in particular a phenyl or naphthyl radical which can be substituted by C1 -C4 -alkyl, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec.-butyl or tert.-butyl, C1 -C4 -alkoxy, for example methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec.-butoxy or tert.-butoxy, halogen, for example fluorine, chlorine or bromine
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