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The authors wish to acknowledge Dr Franc¸oise Gue´ritte
(CNRS-ICSN, Gif-sur-Yvette) for kindly sending the 1H and
13C NMR spectra of the natural Nb-desmethyl-meso-chimo-
nanthine (3).
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4640 | Chem. Commun., 2006, 4638–4640
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