D. R1 = R2 = R3 = R4 = H: 4-0-(3-amino-3-deoxy-a-D-glukopyranosyl)-6-O-(6-amino-6-deoxy-a- -D-glukopyranosyl)-2-deoxy-L-streptamin (kanamycin).
D. R1 = R2 = R3 = R4 = H: 4-0-(3-amino-3-deoxy-a-D-glukopyranosyl)-6-O-(6-amino-6-deoxy-a- -D-glukopyranosyl)-2-deoxy-L-streptamin (kanamycin).