title: (-)-Benzyl 2,3-dide-oxy-β-d-erythro-hex-2-eno-pyran-oside.
abstract: In the title compound, C13H16O4, the six-membered ring of the sugar moiety shows a half-chair conformation. In the crystal, mol-ecules are connected via O-H⋯O hydrogen bonds, forming columns around twofold screw axes along the b-axis direction. There is a disorder of the benz-yloxy group, which has two possible orientations with the phenyl group lying on a common plane [site-occupancy factors = 0.589 (9) and 0.411 (9)].
authors.affiliation: Research and Education Center for Natural Sciences, Keio University, Hiyoshi 4-1-1, Kohoku-ku, Yokohama 223-8521, Japan.
authors.forename: Shigeru
authors.initials: S
authors.lastname: Ohba
authors.affiliation: Department of Pharmaceutical Science, Keio University, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan.
authors.forename: Hayato
authors.initials: H
authors.lastname: Okazaki
authors.affiliation: Department of Pharmaceutical Science, Keio University, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ueda
authors.affiliation: Department of Pharmaceutical Science, Keio University, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan.
authors.forename: Kengo
authors.initials: K
authors.lastname: Hanaya
authors.affiliation: Department of Pharmaceutical Science, Keio University, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan.
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Shoji
authors.affiliation: Department of Pharmaceutical Science, Keio University, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sugai