| http://www.w3.org/ns/prov#value | - ???COO???, ???OCO??? or ???CH???CH???, and optional hydrogen may be substituted with halogen; and m and n each are an integer of approximately 0 to approximately 5.Preferred Ra are hydrogen, chlorine, fluorine, cyano, ???N???C???O, ???N???C???S, alkyl, alkoxy, alkoxyalkyl, alkoxya
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