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Synthesis of probe 8 by the esterification of 1 with IAF tag 6. Methyl ester 7 was prepared as a negative control for the IAF tag. NMR analyses suggested the presence of both C6 and C8 isomers as duplicate peaks were observed at proximal positions, H9/C9 and H10/C10, while single peaks at remote positions such as H1/C1 and H13/C13 (see Supporting Information).
