Figure 1. ¹³C NMR spectra of the OS (a) and the O-deacylated LPS (b) from P. stuartii O20. CO resonances are not shown. Arabic numerals refer to carbons in sugar residues denoted as shown in Table 1 and Table 2. NAc, N-acetyl groups; FA, fatty acyl groups.

Figure 2. Part of a ¹H,¹³C HMBC spectrum of the O-deacylated LPS from P. stuartii O20. The corresponding parts of ¹H and ¹³C NMR spectra are displayed along the horizontal and vertical axes, respectively. Arabic numerals before slash refer to protons and after slash to carbons in sugar residues denoted by letters as shown in Table 1 and Table 2.

¹H NMR data of the OS and O-deacylated LPS from P. stuartii O20 (δ, ppm; J_H,H, Hz)

Data of an oligosaccharide with an α-d-GlcpNAc-(1→8)-β-8eLegp5Acyl7Ac fragment at the reducing end from Salmonella arizonae O61⁶ are given in parentheses.

Additional chemical shifts for CH₃CON are δ ^a2.01; ^b2.00; ^c1.99; ^d1.94; ^e1.95; ^f2.05.

¹³C NMR data of the OS and O-deacylated LPS from P. stuartii O20 (δ, ppm)

Additional chemical shifts for CH₃CON are δ ^a23.3 (CH₃) and 175.9 (CO); ^b23.5 and 175.1; ^c23.6 and 175.3; ^d23.3 and 175.3; ^e23.5 and 176.1; ^f24.1 and 175.4.