prov:value
| - Ar is a group or Ar is cyclopentyl, cyclohexyl, naphthyl, anthracyl, biphenylyl or an O???, S??? or N-containing 5- or 6-membered heterocyclic ring, where the radicals cyclopenyl, cyclohexyl, naphthyl, anthracyl, biphenylyl and 5- or 6-membered heterocyclic ring are unsubstituted or substituted by halogen, C1???C4 alkyl and/or C1???C4 alkoxy;
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