Locations of oxygen-18 label in an aflatoxin precursor, sterigmatocystin, derived from sodium [1-13C,18O2]-acetate were determined using a spin-echo pulse sequence [90°-τ-180°-τ-acquisition, where τ= 1/(2JC-C)] in 13C-n.m.r. spectroscopy to resolve isotope shifts from interfering carbon–carbon couplings(JC-C).
T. T. Nakashima and J. C. Vederas, J. Chem. Soc., Chem. Commun., 1982, 206 DOI: 10.1039/C39820000206
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