| http://www.w3.org/ns/prov#value | - unsubstituted and substituted aryl, the aryl portion of which preferably contains from about 6 to 24 carbon atoms, such as phenyl, naphthyl, and phenanthryl, and the substituents of which are preferably selected from alkyl, nitro, halogen (such as chloro, bromo, and iodo), N,N-dialkylamino as defined above, alkoxy as defined above, alkylthio as defined above, carboxy, sulfonato, hydroxyalkyl as de
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