Reconsidering mass spectrometric fragmentation in electron ionization mass spectrometry – new insights from recent instrumentation and isotopic labelling exemplified by ketoprofen and related compounds

Rationale In various fields of chemical analyses, structurally unknown analytes are considered. Proper structure confirmation may be challenged by the low amounts of analytes that are available, e.g. in early stage drug development, in metabolism studies, in toxicology or in environmental analyses....

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