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Summary of NMR analysis of polyketides 1, 2, and 4. HMBC and H2BC (solid arrows) and highlighted 1H–1H COSY (dashed arrows) correlations are shown for desmethyl heptaketide 1, methyl heptaketide 2, and methyl octaketide 4. 1H and 13C chemical shifts are listed in Table S4. Carbon positions 1–12 (bold, red) could be 13C-labeled.
