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LC-MS/MS chromatograms of synthetic l,l-TMAP-l-Phe-OMe (1.78 min, a), d,d-TMAP-l-Phe-OMe (2.01 min, b), a mixture of synthetic l,l-TMAP-l-Phe-OMe and d,d-TMAP-l-Phe-OMe (c), x17299-l-Phe-OMe (1.78 min, d), a mixture of x17299-l-Phe-OMe and synthetic l,l-TMAP-l-Phe-OMe (e), and a mixture of x17299-l-Phe-OMe and synthetic d,d-TMAP-l-Phe-OMe (f)
