Synthesis and preliminary in vitro biological evaluation of a selective high-affinity CRTH2 antagonist is described. The stability of an N-benzyl group facilitated synthesis of the corresponding radioligand by tritiation of a brominated precursor. The compound [(3)H]TRQ11238 represents the first selective CRTH2 antagonist radioligand and exhibited a specific radioactivity of 52 Ci/mmol and a pK(d) of 9.0.
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