Isepamicin Impurity 15

(2S,2'S) -N, N'- ((1R,3S,4R,5R,6S) -4- (((2R,3R,4S,5S,6R) -6- (aminomethyl) -3,4,5-trihydroxytetrahydro-2H-pyran-2-yl) oxy) -6- (((2R,3R,4R,5R) -3,5-dihydroxy-5-methyl-4- (methylamino) tetrahydro-2H-pyran-2-yl) oxy) -5-hydroxycyclohexane-1,3-diyl) bis (3-amino-2-hydroxypropanamide)