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Acetate labelling pattern of amphidinol A (1). c: carbons labelled from [1-13C]-acetate. m: carbons labelled from [2-13C] acetate. c-m: incorporation of intact acetate unit from [1,2-13C2]-acetate. Discontinuous labelling is evidenced with the dashed boxes. The inset shows a proposed mechanism for a Favorskii-type rearrangement from [26].
