The Constitutional Amine of Antibiotic YA-56

In addition to the previously reported six amino acids and two carbohydrates (one disaccharide), 3-aminopropionamidine was isolated as a constituent from the acid hydrolyzate of the antibiotic YA–56X, one of the major component of antibiotic YA–56 complex. Based on the hitherto found informations, structural comparison of the antibiotic YA–56 X and Y was made with phleomycins, bleomycins, zorbamycin and zorbonomycin B to which antibiotic YA–56 closely related. Among those, zorbamycin was identical with antibiotic YA–56 X.