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64Cu-labeling of NOTA-HTL-S/M/L. A. A crude radio-HPLC trace of 64CU-NOTA-HTL-S before purification. B. A crude radio-HPLC trace of 64Cu-NOTA-HTL-M before purification. C. A radio-HPLC trace of 64CuCl2 as a reference. D. Size exclusion column chromatography profile of 64Cu-NOTA-HTL-L, which showed no contamination of 64CuCl2 (eluted after 6 mL).
