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- [48] N,N,N-Trimethyl-5-[(2,3,5,6-tetrafluorophenoxy)-carbonyl]pyridin-2-aminium trifluoromethane-sulfonate a precursor for the synthesis of 2,3,5,6-tetrafluorophenyl 6-[18F]-fluoronicotinate ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY, 2018, 74 : 604 - +