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(A) Stability of the tosylate precursor (OTsE-PE2I) evaluated in DMSO at 140 °C added to the dried QMA/PS-30 eluate. (B) Stability of the reference FE-PE2I evaluated in DMSO at 140 °C (if nothing else is stated) added to the dried QMA/PS-30 eluate. (C) Radiochemical conversion for [18F]FE-PE2I using QMA/K2CO3/K222 or PS-30/Et4NHCO3 elution in DMSO at 140 °C over time. (D) Radiolabeling reaction to form [18F]FE-PE2I.
