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A-PVP (also known as α-PVP, A-PVP, alpha-PVP, alpha-Pyrrolidinovalerophenone and flakka) is a novel stimulant substance of the cathinone class. α-PVP is chemically related to prolintane and belongs to a group called the substituted cathinones, which includes compounds like MDPV, hexen, and a-PHP. It acts as a norepinephrine-dopamine reuptake inhibitor.