http://www.w3.org/ns/prov#value | - not limited to, atoms such as oxygen, nitrogen, sulfur, phosphorus, silicon, and the like, as well as mixtures thereof, wherein two or more of the R groups can be joined together to form a ring, and where the substituents on the substituted alkyl, aryl, arylalkyl, alkylaryl, and heterocyclic groups can be (but are not limited to) hydroxy groups, amine groups, imine groups, ammonium groups, pyridin
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