Stereochemical assignments of yuanhuacin were performed through two‐dimensional COSY, ROESY, 1 H and 13 C shift correlation spectroscopy (HETCOR and FLOCK), and ambiguous assignments were resolved through molecular modeling comparisons. This combination of techniques is applicable for the assignment of 1 H and 13 C chemical shifts of polycyclic compounds containing high percentages of quaternary carbons.
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Zhou et al. (1993) studied this question.
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