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

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MSⁿ sequencing of the ¹³C₄-octadepsipeptide ethyl ester (upper masses: calculated, lower masses given in parenthesis: measured [M+K]⁺ ions); •: ¹³C-labeling of α-hydroxy isovaleric acid and valine.