Synthesis of four spacer-containing trisaccharides with the 4-O-(β-L-rhamnopyranosyl)-D-glucopyranose unit in common, representing fragments of capsular polysaccharides from
Streptococcus pneumoniae types 2, 7F, 22F, and 23F
Vliegenthart, J.F.G.; Steijn, A.M.P. van; Kamerling, J.P.
(1992) Journal of carbohydrate chemistry, volume 11, issue 6, pp. 665 - 689