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New synthesis process of 4-formamide antipyrine
Duan Guangbo1, Wu Sheng2, Xu Huan2, Liu Xiaolian3, Ma Ningning3, Dong Yongguang3, Guo Mengxi3
1. Hebei Jihengqingxian Chemical Corporation Ltd., Cang zhou 061200, China; 2. Shenzhou City Jiheng Pharmaceutical Corporation Ltd., Shen zhou 053800, China; 3. Hebei Ji heng Pharmaceutical Corporation Ltd., Hengshui 053400, China


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