The antibiotic YA-56 complex: isolation, purification and physicochemical properties of the main components.

Isolation, purification and physicochemical properties of the antibiotic complex YA-56, a family of phleomycin-bleomycin group, are described. The antibiotic YA-56 complex was found to be composed mainly of two active components named YA-56X and Y. These components were clearly differentiated from the reported phleomycins and bleomycins by their physicochemical properties. However, by direct comparison, YA-56 X was found to be identical with zorbamycin reported recently. YA-56Y was recognized to be a new antibiotic.