B. R¹ = R² = acyl, R³ = R⁴ = H: 4-O-(3-amino-3-deoxy-α-D-glukopyranosyl)-6-O-(6-amino-6-deoxy- α -D-glukopyranosyl)-N¹,N³-bis[(2,S)-4-amino-2-hydroxybutanoyl]-2-deoxy-L-streptamin,