OBJECTIVE Wide spread abuse of synthetic cathinones found in bath salts preparations has resulted in regulation of some cathinones internationally.Chemists skirt these laws by altering the chemical structures of first-generation cathinones（ie,MDPV,methylone,and mephedrone）,resulting in second-generation cathinones（eg,α-PVP,α-PPP,MDPPP,and MDPBP）.Although MDPV is a more effective reinforcer than cocaine,little is known about the reinforcing effectiveness of secondgeneration cathinones.To test the... 

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