Chemical feedstocks for synthesizing fentanyl, primarily supplied by China to Mexican cartel labs, that sit at the center of the US opioid crisis and US-China trade diplomacy.

北京将所有INCB列管前体纳入管制并增设出口管控；华盛顿起诉六名中国公民，指控其向墨西哥湾海湾贩毒集团网络供应化学品