| http://www.w3.org/ns/prov#value | - Aryl or Ar refers to a monovalent unsaturated aromatic carbocyclic group having a single ring (e.g., phenyl) or multiple condensed rings (e.g., naphthyl or anthryl), which can optionally be unsubstituted or substituted with hydroxy, lower alkyl, alkoxy, chloro, halo, mercapto, and other non-interfering substituents.
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