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A) Representative UV/vis HPLC chromatogram of 4 (insert: MS spectrum of 4). B) Radio‐HPLC chromatogram of [18F]F‐4. C) Representative UV/vis HPLC chromatogram of 4 without BF2 (insert: MS spectrum of 4 ‐BF2). D) UV/vis HPLC chromatogram of [18F]F‐4 showing loss of the BF2 entity during radiolabeling by Lewis acid mediated isotopic 19F/18F isotopic exchange.
