Abstract
Pyrazole 2a is a novel, potent ligand for insect GABA receptors obtained from housefly head membrane preparations (K(i)=8 nM). It is 500-fold selective against the mammalian receptor (mouse brain preparations). Its specifically tritiated version (2b) was synthesized by reduction of disulfide 10 with NaBH(4) followed by alkylation with [3H(3)]-CH(3)I.
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