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Stock standard solution chromatogram peak assignments and approximate retention times: (1) Octopamine (11.7 min), (2) p-synephrine (14.6 min), (3) phenylephrine (18.0 min), (4) tyramine (18.7 min), (5) N-methyltyramine (20.1 min), and (6) hordenine (22.8 min).
