1-(2-Methoxyphenyl)piperazine hydrochloride is a key agent intermediate of antipsychotics with high affinity to the serotonin receptors and 5-HT, which can be used to synthesize the intestinal worm-repellent agents Piperazine phosphate (HY-B0912C) and Piperazine citrate (HY-17599), as well as Fluphenazine (HY-119980), dihydrochloride, Rifampicin (HY-B0272)[1].