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4-CL-PVP (4-Chloro-α-pyrrolidinovalerophenone) is a synthetic stimulant from the pyrrolidinophenone family, structurally related to α-PVP (Flakka) and other substituted cathinones. It is classified as a novel psychoactive substance (NPS) and is known for its stimulant and euphoric effects, similar to other synthetic cathinones and pyrovalerone derivatives.