The capsular polysaccharide of Streptococcus pneumoniae serotype 6B [→2)-α-D-Galp-(1→3)-α-D-Glcp-(1→3)-α-L-Rhap-(1→4)-D-Rib-OH-(5-P→]n was depolymerised under alkaline (NaOH) and acidic (HF) conditions. The former treatment yielded, as the major component, α-2-P-Galp-(1→3)-α-Glcp-(1→3)-α-Rhap-(1→4)-5-P-Rib-OH. The latter treatment at -16 degrees gave α-Galp-(1→3)-α-Glcp-(1→3)-α-Rhap-(1→4)-Rib-OH-(5-P→2)-α-Galp-(1→3)-α-Glcp-(1→3)-α-Rhap-(1→4)-Rib-OH and at 4 degrees gave α-Galp-(1→3)-α-Glcp-(1→3)-α-Rhap-(1→4)-Rib-OH. These oligosaccharides were characterised by sugar analysis, f.a.b.-m.s., and 1H- and 13C-n.m.r. spectroscopy.

13C NMR data:
Linkage	Residue	C1	C2	C3	C4	C5	C6
4,3,3	aDGalp	100.57	69.92	70.64	70.43	72.00	62.13
4,3	aDGlcp	96.78	71.44	79.96-80.90	71.07	72.77	61.38
4	aLRhap	101.06	68.25	76.64	71.51	70.64	17.99
	xDRib-ol	63.84	72.84	73.30	79.96-80.90	60.74


1H NMR data:
missing...

There is only one chemically distinct structure:

SVGMWSMILES3D molIonize

 

C[C@@H]1O[C@@H](O[C@H](CO)[C@@H](O)[C@@H](O)CO)[C@H](O)[C@H](O[C@H]2O[C@H](CO)[C@@H](O)[C@H](O[C@H]3O[C@H](CO)[C@H](O)[C@H](O)[C@H]3O)[C@H]2O)[C@H]1O

622.57 g/mol (C₂₃H₄₂O₁₉)