A series of novel 1H-pyrazolo-[3,4-c]cyclophepta[1,2-c]thiophenes was prepared and screened at selected dopamine receptor subtypes. Compound 4 (NGB 4420) displayed high affinity and selectivity (>100-fold) for the D(4) over D(2) and other CNS receptors. This compound was identified as a D(4) antagonist via its attenuation of dopamine agonist-induced GTPgamma(35)S binding at D(4) receptor.

中文翻译：

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1H-吡唑并-[3,4-c]环庚[1,2-c]噻吩：一种独特的多巴胺D4选择性配体结构。

制备了一系列新颖的1H-吡唑并-[3,4-c]环庚[1,2-c]噻吩，并在选定的多巴胺受体亚型中进行了筛选。与D（2）和其他CNS受体相比，化合物4（NGB 4420）对D（4）表现出较高的亲和力和选择性（> 100倍）。该化合物通过其在D（4）受体上的多巴胺激动剂诱导的GTPgamma（35）S结合减弱而被确定为D（4）拮抗剂。