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7-Acetamido-7-deoxy-L- galacto -heptulose was prepared by oxidation of l-acetamido-l-deoxy-D- glycero-D-galacto-heptitol with Acetobacter suboxydans . The new acetamido-deoxy-L-heptulose was shown to be a pyranose by comparison with β -D-fructopyranose. The following equations represent the optical rotation of 7-acetamido-7-deoxy- α -L- galacto -heptulopyranose in water at 20 °C and 3.5 °C, respectively: [ α ] 20 D = - 15.5 e - .0396 t - 97.1 , [ α ] 3.5 D = - 11.9 e - .0101 t - 105.8 where t is the time in minutes after dissolution of the sample.