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Abstract
AbstractThe mass spectra of cyclo‐(Gly‐Leu), cyclo‐(Gly‐Tyr), cyclo‐(Ala‐Tyr), cyclo‐(Leu‐Tyr), cyclo‐(Val‐Phe) and cyclo‐(Leu‐Phe) are presented. The use of high resolution mass measurements and metastable analysis allows the proposal of some general fragmentation mechanisms. The dominant features in the mass spectra of 2,5‐diketopiperazines are fragments corresponding to cleavages of sidechains and the rupture of the piperazine‐2,5‐dione ring. The characteristic fragments may be used in the identification of any 2,5‐diketopiperazines by mass spectrometry.
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