| http://www.w3.org/ns/prov#value | - nd ???CH(COOX1)2, wherein X1 is as set forth above; (iv) ???CH(X2)(X3), wherein X2 and X3 are as set forth above; (v) an unsubstituted, mono-, di-, or tri-substituted aryl group, such as phenyl, naphthyl, phenanthryl, or pyrenyl; 9-julolidinyl; or an unsubstituted, mono- or di-substituted heteroaromatic group chosen from pyridyl, furanyl, benzofuran-2-yl, benzofuran-3-yl, thienyl, benzothien-2-yl,
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