Received 15 December 2011
The title compound, C13H24O10 is the methyl glycoside of a structural element -L-Fucp-(1 3)--D-Galp making up two thirds of the repeating unit in the capsular polysaccharide of Klebsiella K63. The conformation of the title compound is described by the glycosidic torsion angles H = 55 (1)° and H = -24 (1)°. The hydroxymethyl group in the galactose residue is present in the gauche-trans conformation. In the crystal, O-HO hydrogen bonds connect the disaccharide units into chains along the a-axis direction and further hydrogen bonds cross-link the chains.
The capsular polysaccharide (CPS) of Klebsiella K63 contains a repeating unit consisting of 3)--D-GalpA-(1 3)--L-Fucp-(1 3)--D-Galp-(1 , see: Joseleau & Marais (1979). For an investigation of the CPS S-156 from Klebsiella pneumoniae ATCC 316 46, see: Johansson et al. (1994) and of the CPS from Klebsiella pneumoniae I-1507, see: Guetta et al. (2003). For a fiber X-ray diffraction study of the Klebsiella K63 CPS, see: Elloway et al. (1980). For the synthesis, see: Baumann et al. (1988).
Data collection: MARCCD (Marresearch, 2010); cell refinement: CrysAlis RED (Oxford Diffraction, 2008); data reduction: CrysAlis RED; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 1999); software used to prepare material for publication: PLATON (Spek, 2009).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB6569 ).
This work was supported by a grant from the Swedish Research Council and by the Faculty of Natural Sciences at Stockholm University
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