 4-Chloro-alpha-pyrrolidinovalerophenone

4-Chloro-"alpha"-pyrrolidinovalerophenone (also known as 4-chloro-"alpha"-pyrrolidinopentiophenone, 4-chloro-α-PVP, 4Cl-PVP, or 4C-PVP) is an emerging recreational designer drug of the pyrrolidinophenone class, similar in structure to "alpha"-pyrrolidinopentiophenone (α-PVP).The pharmacology and toxicity of this compound is unknown.