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(A) 1H-NMR and HSQC spectra of the isolated contaminant. Signals for 4,6-O-sulfo-N-acetyl-galactosamine (A) and of 2,3-O-sulfo-glucuronic acid (U) are labelled. (B) 1H-NMR and HSQC spectra of the chemically synthesized oversulfated chondroitin.
