| http://www.w3.org/ns/prov#value | - uted by halogen, ???COOH, ???CN, ???CF3, ???OCF3, ???OH, ???NH2, or C1-C6-alkyl. [0171] In another embodiment A is one of the following structures [0172] wherein [0173] R20 is hydrogen or C1-C6-alkyl, [0174] R21 is hydrogen or C1-C6-alkyl, [0175] U and V are a valence bond or C1-C6-alkylene optionally substituted with one or more hydroxy, C1-C6-alkyl, or aryl independently, [0176] J is C1-C6-alkyl
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