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In a previous publication, we reported on the analysis of several dietary supplement/exercise formulas and the quantitation of N,α-diethylphenethylamine (N,α-ETH, 3: ). In this article we report on the reanalysis of these products using LC-MS-MS and GC-MS methods capable of clearly separating the N,α-isomer ( 3: ) from its N,β-isomer (N,β-ETH, 4: ). The reanalysis, by both methods, showed that all samples previously reported as containing N,α-ETH ( 3: ) do contain only that isomer with no detectable concentrations of the N,β-ETH ( 4: ).

LC-MS-MS Analysis of N, -Diethylphenethylamine (N, -ETH) and Its Positional Isomer N, -Diethylphenethylamine (N, -ETH) in Dietary Supplements