In search of a serotonin 5-HT(7) radiotracer for positron emission tomography, we developed 1-[2-[(2S)-1-(phenylsulfonyl)pyrrolidin-2-yl]ethyl]piperidin-4-yl 4-fluorobenzoate. After labeling in good yield with fluorine-18 via nitro for fluorine exchange, preliminary biological experiments with autoradiographies failed to evidence any specific 5-HT(7) receptor delineation.
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