| http://www.w3.org/ns/prov#value | - Examples of optionally substituted aryl groups R63 or R64 include phenyl optionally substituted with one or more groups selected from C1-6 alkyl group such as methyl or ethyl (either of which may be optionally substituted with a functional group such as hydroxy), or a functional group as defined above (such as halo like fluoro, chloro or bromo, hydroxy, alkoxy such as methoxy, trifluoromethyl, nit
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