| http://www.w3.org/ns/prov#value | - r aralkyl (optionally substituted by halo, alkyl, aryl, hydroxy, alkoxy, aralkyl amino, dialkylamino, monoalkylamino, nitro, carboxy, alkoxycarbonyl, aminocarbonyl, monoalkylaminocarbonyl, or dialkylaminocarbonyl); and R16 is a mono-, bi- or tricyclic heterocyclic ring system containing from 3 to 15 ring members including carbon and 1 to 4 hetero atoms selected from nitrogen, oxygen and sulfur ato
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