Fig. 2. Overlaid portions of 1H-NMR spectra obtained for synthetic lipopeptides (blue traces) and previously published spectra (red traces) corresponding to: (A) brevicidine (1) and (B) laterocidine (2). The peak at ca. 3.96 ppm in the published spectrum of brevicidine is attributed to an impurity not present in the synthetic material. Spectra recorded in DMSO-d6 at RT. Full 1H-NMR spectra provided in the ESI.†.
