2,3-Dichlorophenylpiperazine (2,3-DCPP or DCPP) is a chemical compound from the phenylpiperazine family. It is both a precursor in the synthesis of aripiprazole and one of its metabolites. It is unclear whether 2,3-DCPP is pharmacologically active as a serotonin receptor agonist similar to its close analogue 3-chlorophenylpiperazine (mCPP), though it has been shown to act as a partial agonist of the dopamine D<sub>2</sub> and D<sub>3</sub> receptors.
2,3-DCPP has been made illegal in Japan and Hungary after having been identified in seized designer drug samples.
The positional isomer 3,4-dichlorophenylpiperazine (3,4-DCPP) is also known, and acts as both a serotonin releaser via the serotonin transporter, and a ò<sub>1</sub>-adrenergic receptor blocker, though with relatively low affinity at both targets.
The 3,4,5-Trichlorophenylpiperazine [67305-64-0] ("3 stripes") is also a highly regarded arrangement & has been awarded the Beecham patent of . Such 3,4,5-Trisubstituted aromatic entities is already known from clenbuterol. Leading to CID:151687078 (Ex 6 is a concrete example of this) i.e. 1-(4-Amino-3,5-dichlorophenyl)-4-(4-phthalimido-1- butyl)piperazine.