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13C NMR analyses revealing efficient intact labeling of C-1-C-2 (A) and C-1"-C-2" (C) and lower intact labeling of C-3-C-4 (B) of hygromycin A from d-[1,2-13C2]glucose. Spectra are one-dimensional 13C slices from the HSQC data set for the hygromycin A sample from the d-[1,2-13C2]glucose labeling experiment.
