A methyl ether of a 2-desoxyhexomethylose, isomeric with cymarose. Obtained on hydrolysis of sarmentocymarin, a glycoside isolated from seeds of Strophanthus sarmentosus DC., Apocynaceae by the enzymic method: Jacobs, Heidelberger, J. Biol. Chem. 81, 765 (1929); Jacobs, Bigelow, ibid. 96, 355 (1932). Synthesis: H. Hauenstein, T. Reichstein, Helv. Chim. Acta 33, 446 (1950).