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Structural elucidation of YPMs on the basis of 1D and 2D NMR and CD spectroscopic data analysis. (A) Key 1H−1H COSY (red) and HMBC (blue) correlations of 1–5. (B) Key ROESY correlations (green) of 1 and 2. (C) CD spectra of 1 in comparison with authentic stands of UCM and TNM A, supporting the assignment of their absolute stereochemistry.
