4-Chloro-ñ-pyrrolidinovalerophenone (also known as 4-chloro-ñ-pyrrolidinopentiophenone, 4-chloro-ñ-PVP, 4Cl-PVP, or 4C-PVP) is an emerging recreational designer drug of the pyrrolidinophenone class, similar in structure to ñ-pyrrolidinopentiophenone (ñ-PVP). The pharmacology and toxicity of this compound is unknown, though it is presumed to be a stimulant drug.
In the United States, 4-chloro-ñ-PVP is a Schedule I Controlled Substance.