prov:value
| - R2 as phenyl is a phenyl radical which is unsubstituted or substituted by C1 -C4 alkyl, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl or tert-butyl, C1 -C4 alkoxy, such as ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy or tert-butoxy, C2 -C4 alkanoylamino, for example acetylamino or propionylamino, or halogen, for example fluorine, chlorine or bromine.
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