Abstract: A compound of the general formula: ##STR1## wherein R.sub.1 and R.sub.2 are different and each represents a hydrogen atom or a methyl group, R.sub.3 represents a hydrogen atom, or a glycyl group which may be substituted, and the symbol between the carbon atoms at the 5- and 6- positions represents a single or double bond, and an acid addition salt thereof; and its antibiotic use.

Abstract: Novel aminoglycosides of the following formula ##STR1## wherein R.sub.1 and R.sub.2 are identical or different and each represents a hydrogen atom or a methyl group, R.sub.3 represents a hydrogen atom or an optionally substituted aminoacyl group having 2 to 4 carbon atoms in the acyl moiety, and when all of R.sub.1, R.sub.2 and R.sub.3 are hydrogen atoms, the methylamino group at the 4-position is not oriented trans to the hydroxyl groups at the 3- and 5-positions; and acid addition salts thereof, which are useful as antibiotics; and process for producing compounds containing the same.

Abstract: This invention relates to new processes for the production of a 1-N-(.alpha.-hydroxy-.omega.-aminoalkanoyl)-3'-deoxy-5-O-pentofuranosylnea mine, including 3'-deoxybutirosins A and B, as a semi-synthetic antibiotic. This invention further relates to new and useful semi-synthetic antibiotics which are produced by the above new processes.

Abstract: Lividomycin B derivatives having enhanced antibacterial activity are provided; the 6'-deoxy-6' substituted or unsubstituted amino lividomycins are prepared by masking the functional groups other than the 4' - and 6' -hydroxyl groups, converting the 6' hydroxyl group to an amino group and then removing the remaining protective groups.