4-Chloropyrrolo[2,3-d]pyrimidine

4-Chloropyrrolo[2,3-d]pyrimidine (CAS 3680-69-1) is manufactured directly by Hangzhou Lucky Biology Co., Ltd. and marketed as a key intermediate in the synthesis of tofacitinib citrate. It carries an industrial-grade specification, samples are available, and it is sold across North America, Europe, Asia, and the Middle East.