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. Author manuscript; available in PMC: 2010 Aug 28.
Published in final edited form as: Chem Biol. 2009 Aug 28;16(8):893–906. doi: 10.1016/j.chembiol.2009.06.012

Figure 2.

Figure 2

Homonuclear and heteronuclear coupling constant values used to assign the relative configuration of Ahdhe (C10-C18) and Dmetua (C30-C44). The magnitude of the coupling constants, (S) for small and (L) for large, allowed identification of gauche and anti orientations between the indicated atoms. For 1,2-methine systems in which the threo rotamer A3 can not be distinguished from the erythro rotamer B3, NOE data (↔) provided an unambiguous assignment. aRelative configuration and rotamer designation according to Matsumori et al. (1999). bWeak couplings with 3JH,H < 0.5 Hz were considered as 0 Hz. cNo correlation observed in HSQMBC as expected for a coupling of 0 Hz.