1,5:3,4-Dianhydro-2-deoxy-3-C-methyl-D-erythro-pentitol 134309-95-8 4-Methyl-3,4-epoxytetrahydropyran D-erythro-Pentitol, 1,5:3,4-dianhydro-2-deoxy-3-C-methyl-