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| Figure 1: Chromatograms of: (a) a standard solution containing M6G (600ng/ml), M3G (3000ng/ml), OXY (600ng/ml), MOR (600ng/ml), and the IS (1000ng/ml); (b) a blank plasma sample; (c) a plasma sample added the standards, spiked with the same concentrations of the analytes and the IS. |
