The Avileurekanoses A and C and Further Degradation Products of the Avilamycins A and CAlkaline hydrolysis of the orthosomycin antibiotics, avilamycins A ad C products similar t those earlier described for flambamycin. Among these avileurekanose c (15) became of particular importance because its acetate prisms suitable for an X‐ray structural determination. For the avilamycins A and C structural formulae2and3, respectively, can now be drawn, in which only the configuration at C (16), one out of 32 asymmetric C‐atoms, is not yet determi