The microbiological oxidation of 1-deoxy-1-N-methylacetamido-D-glucitol and 2-acetamido-1,2-dideoxy-D-glucitol yielded a syrupy ketose and a crystalline ketose respectively. Crystalline derivatives of each were prepared and structural investigations of the ketoses showed the former to be 6-deoxy-6-N-methylacetamido-L-xylohexulose and the latter to be 5-acetamido-5,6-dideoxy-L-xylohexulose.