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MS/MS spectrum of first 45 s (A) and last 45 s (B) of chromatogram peak at 16–17 min. The characteristic fragment ions from species with one hydroperoxyl group on each phosphatidic acid moiety, m/z 709 and 727, were only found at an earlier retention time, and fragment ions from species with two hydroperoxyl groups on one phosphatidic acid moiety, m/z 759, 723, and 695, at a later retention time, suggesting that the former eluted earlier than the latter.
