The P2X3 receptor is an attractive target for the treatment of pain and chronic coughing, and thus P2X3 antagonists have been developed as new therapeutic drugs. We previously reported selective P2X3 receptor antagonists by derivatization of hit compound 1. As a result, we identified hit compound 3, the structure of which was similar to hit compound 1. On the basis of SAR studies of hit compound 1, we modified hit compound 3 and compound 42 was identified as having analgesic efficacy by oral administration.

中文翻译：

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吡咯啉酮衍生物作为一类新的P2X3受体拮抗剂。第3部分：吡咯并酮衍生物的构效关系

P2X3受体是治疗疼痛和慢性咳嗽的有吸引力的靶标，因此，P2X3拮抗剂已被开发为新的治疗药物。我们先前报道了命中化合物1衍生化的选择性P2X3受体拮抗剂。结果，我们确定了命中化合物3，其结构类似于命中化合物1。在对命中化合物1进行SAR研究的基础上，我们对命中化合物3进行了修饰，化合物42通过口服给药被确认具有镇痛作用。