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. 2015 May 27;5:10637. doi: 10.1038/srep10637

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UPLC-TOF MS analysis of (a) isolated tetradepsipeptide (DP4; m/z 453.2576; ESI⁺) and (b) dipeptides D-O-Leu-D-Ala (m/z 202.1073, [M-H]^–) and L-O-Val-L-Val (m/z 216.1238, [M-H]^–) after alkaline hydrolysis.