| http://www.w3.org/ns/prov#value | - It is preferred that the substituent be an alkyl or heteroalkyl (alkyl containing one or more atoms other than hydrogen or carbon) group containing one to three carbon atoms, inclusive, anaryl or heteroaryl (aryl containing one or more atoms other than hydrogen or carbon) group having one or two aromatic rings each having six or fewer carbon atoms, or an aralkyl or heteroaralkyl group having one o
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