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Four toxic 10aH-9-oxofuranoeremophilanes were isolated and identified from the petroleum ether extract of Senecio bonariensis. Their 13 C NMR spectral data, J 1,10 Altona calculation and a correlation for 1 H NMR (C 6 D 6 /CDCl 3) are discussed.
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Pomilio et al. (1997) studied this question.
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