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Studies on new antibiotic lividomycins. 3. Partial structure of lividomycin A.

The acid methanolysis of lividomycin A gave an amine, which was provisionally designated as C12-amine*, and methyl lividotriosaminide. C12-Amine was degraded to 2-deoxystreptamine and an amino sugar by acid hydrolysis of the N-acetyl derivative. The chemical structure of the amino sugar was determined to be 2-amino-2,3-dideoxy-D-glucopyranose or 3-deoxy-D-glucosamine from the NMRspectrum of peracetylated methyl glycoside of the amino sugar. An ^u-glycosidic linkage between 2-deoxystreptamine and 3-deoxy-D-