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GC/MS chromatograms of (A) a drug sample containing a mixture of ketamine and heroin (diacetylmorphine) with the respective mass spectrum of the peaks at the retention time (RT) of 17.73 and 26.58 min, respectively; and (B) ketamine analytical standard with the relative mass spectrum of the peak at the RT of 17.75 min; and (C) heroin (diacetylmorphine) analytical standard with the relative mass spectrum of the peak at the RT of 26.54 min.
