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Structure elucidation of this group of compounds was accomplished using extensive 1D and 2D NMR spectroscopic studies, including <jats:sup>1<\/jats:sup>H, <jats:sup>13<\/jats:sup>C, COSY, NOESY, HSQC, and gHMBC experiments. The distinction between the linear structures I, II and the cyclic structure III was made mainly on the basis of the analysis of the cross peak between H\u20102 and H\u20104a in the COSY spectra, in combination with the long\u2010range correlation between H\u20102 and C\u20104, 6 in the gHMBC spectra. 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