| http://www.w3.org/ns/prov#value | - These groups may optionally be mono- or polysubstituted by halogen, such as Cl, F or Br or by CF.sub.3 or C.sub.1-4 -alkyl, such as methyl, ethyl, propyl, isopropyl, butyl, isobutyl or tert.-butyl or C.sub.1-4 -alkoxy, such as methoxy, ethoxy,
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