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. 2017 Sep 9;24:71. doi: 10.1186/s12929-017-0377-1

Fig. 3.

Fig. 3

(−)-Phen is primarily metabolized by N-dethylation to yield (−)-N1- and (−)-N8-norphenserine that then are further N-dethylated to (−)-N1,N8-bisnorphenserine. Their brain/plasma ratios under steady-state conditions are shown