Due to oversight, the authors neglected to reference a paper by Zhang et al. in the original version of this Communication. Zhang et al. describe the discovery of eudistamide B, an isomeric compound to cinnapeptin from a marine streptomycete, which differs only in the absolute configuration at three residues. Specifically, eudistamide B contains D-Tyr at residue 8 (rather than L-Tyr in cinnapeptin) and (2S,3R)-3-OH-Leu at residues 6 and 10 (rather than (2S,3S)-3-OH-Leu in cinnapeptin). While slightly different Marfey analysis procedures were used, it is unlikely that either of these procedures led to racemization, as single enantiomers were observed for all amino acids in both compounds with the exception of Tyr in cinnapeptin, the origin of which can be explained based on the biosynthetic gene cluster (see Figure 4 of the Communication). The authors apologize for the missing citation.
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