Figure 6.

Resonance assignments of dehydrated kleboxymycin NMR spectra in acetonitrile-d₃. A, 1D ¹H zg30 spectrum of dehydrated kleboxymycin in acetonitrile-d₃ and proton assignments. B, ¹H-¹H COSY spectrum showing aliphatic protons' (H2–H5) cross-peaks at the region 2–3.8 ppm (right top panel). Aromatic protons' (H10–H12) cross-peaks were observed at the region 7.03–7.51 ppm (right bottom panel). H5 and H6 cross-peaks were also identified. C, 2D ¹H-¹³C HMBC (blue) and HSQC (red for –CH– and pink for –CH2–) overlaid spectrum showing the assignments of carbon without protons attached (C9, C13, and C14).