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Direct-infusion positive ES-MS of control mixture containing 2-amino-6-chloropurine (50 μg/ml), caffeine (50 μg/ml), m-cresol purple (50 μg/ml), tylosin (25 μg/ml), and spinosyn A (50 μg/ml). [M+H]+ ions and adduct ions are shown for each analyte in the control mixture.
