3-Chloro-4-fluorophenylpiperazine
3-Chloro-4-fluorophenylpiperazine (3,4-CFP, Kleferein) is a psychoactive drug of the phenylpiperazine class. It has been sold as a designer drug, first being identified in Poland in 2019.
Source: Wikipedia — 3-Chloro-4-fluorophenylpiperazine (CC BY-SA 4.0)