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The chemical structure of H33258 (a) and radioactive HPLC profile of 131I-H33258 (b) and the corresponding profile of stability study (c). The arrows in (c) denote the peaks corresponding to intact tracer 131I-H33258 (10.01 min) and free iodine (2.97 min) after incubation in human serum at 37°C for 24 h.
