| http://www.w3.org/ns/prov#value | - In the above formula, Rox may be hydrogen, alkyl, such as methyl, ethyl and the like, or halogen, such as chlorine, fluorine, bromine or iodine, and X1 may be an aromatic containing moiety bonded via an aromatic carbon atom, a carbonyl oxy ester moiety, halogen, cyano, oxycarbonyl ester, carboxyl, and the like.
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