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MS/MS spectra and structures of corresponding hydroperoxides of the first 45 s (A) and last 45 s (B) of the chromatographic peak at 22–23 min. The characteristic fragment ion of 13-monohydroperoxides, m/z 639, was only found in A and of 9-hydroperoxides, m/z 559, only in B, suggesting that the former elutes earlier than the latter.
