METHYL 2-O-ALPHA-D-MANNOPYRANOSYL-BETA-D-GLUCOPYRANOSIDE

The structure of the title compound, C13H24O11, has been determined. T he torsion angles of the glycosidic linkage connecting the two sugar r esidues, phi(H) (H1'-C1'-O2-C2) and psi(H) (C1'-O2-C2-H2), have values of -62.7 (2)degrees and -28.6 (2)degrees, respectively. The conformat ion in the crystal is similar to that obtained by energy minimization in vacuo using the HSEA (hard-sphere exo-anomeric) force field. A chai n of seven interresidue hydrogen bonds, involving all possible H-atom donors in the molecule is observed. The chain is terminated by a ring O atom as an acceptor.