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. 2014 Feb 13;57(6):2746–2754. doi: 10.1021/jm500059t

Figure 3.

Figure 3

(a) Overlays of 1H NMR spectra of 1 (C8,C9-trans, red and green) and 8 (C8,C9-cis, blue and violet) in DMSO-d6 and CDCl3, respectively. The resonance of N28-H in 1 and 8 is marked with red and blue ovals in the overlays. (b) Parts of the ROESY spectra of 1 and 8 recorded in DMSO-d6 showing crosspeaks from N28-H. ROESY crosspeaks across the eight-membered hydrogen-bonded ring are marked with red ovals in the spectrum of 1. (c) 1H–15N HMBC of 1 in DMSO-d6. The crosspeak resulting from the coupling of N28-H and N15 is marked with a red circle.