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Structural characterization of products A and B by MALDI/MS. A and B, negative MALDI-TOF mass spectra of product A (A) and product B (B). C and D, negative MALDI-TOF/TOF mass spectra of product A (C) and product B (D). *, matrix ions; **, [M−H]− ions from contaminating C50-P-d-GalNAc.
