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The objective of this study was to provide LC and GC-multiple mass spectrometry (MS n ) data in positive and negative ion modes to prove the distinction between dexamethasone and betamethasone in a mixture of both components. Using GC-MS, the differentiation was based on a difference in the ratio of the ion traces of the two chromatographic peaks of the α and β epimer with m/z 310 and 330...
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