3, F, Cl, Br, I; wherein R" is H, alkyl, aralkyl, or heteroaralkyl; R is formula (II), (III), (IV), (V), (VI), (VII) wherein, independently for each occurrence, R1 is H, alkyl, or aryl, or R1 and R2 taken together form a fused ring; R2 is H, alkyl, or aryl, or R2 and R1 taken together form a fused ring, or R2 and R3 taken together form a spirocyclic ring; R3 is H, alkyl, or aryl, or R3 and R2 taken together form a spirocyclic ring; R4 is H, alkyl, aryl, hydroxy substituted alkyl, or -C(O)ONa; R5 is H, alkyl, or aryl; R6 is H, alkyl, or aryl; and L1 is O or H2.">
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