MM46115, a novel antiviral antibiotic produced by the fermentation of Actinomadura pelletieri IP/729.63, was shown by spectroscopic studies to have tetronic acid containing macrolide structure I and be a new member of the tetrocarcin and kijanimicin family of antibiotics.The mol. also contains a novel diaminohexopyranose linked to a substituted salicylic acid moiety via an amide bond.Evidence for the proposed structure I is presented.