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Quantitative determination of glycopyrrolate in human plasma by liquid chromatography-electrospray ionization mass spectrometry: The use of a volatile ion-pairing agent during both liquid-liquid extraction and liquid chromatography
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Exact mass measurement of product ions for the structural confirmation and identification of unknown compounds using a quadrupole time-of-flight spectrometer: a simplified approach using combined tandem mass spectrometric functions
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Solid-phase extraction technique for gas-chromatographic profiling of acylcarnitines