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Key NOESY correlations in M2-1 (A), M2-2 (B); and the major differences of the 1H and 13C NMR data of M2-1 (A) and M2-2 (B), respectively; growth inhibitory effects of M2, and its stereoisomers (M2-1 and M2-2) against human colon cancer cells HCT-116 (C) and human lung cancer cells H-1299 (D). Bar, standard error (n=6).
