Fig. 2

1H diffusion-ordered spectroscopy (DOSY) NMR spectra of 33G (A), 33G-like (B-C) and artificial 33G-like (D) pneumococcal isolates identified in this study compared with the 33G polysaccharide spectrum reported previously (E) [2] at 500 MHz and 25 °C. CWPS = cell wall polysaccharide. Highlighted areas denote the location of acetylation peaks