Sisomicin Impurity 13

Tert-butyl ((S) -4- (((1R,2S,3S,4R,5S) -5-amino-4- (((2S,3R) -3- ((tert-butoxycarbonyl) amino) -6- (((tert-butoxycarbonyl) amino) methyl) -3,4-dihydro-2H-pyran-2-yl) oxy) -2- (((2R,3R,4R,5R) -3,5-dihydroxy-5-methyl-4- (methylamino) tetrahydro-2H-pyran-2-yl) oxy) -3-hydroxycyclohexyl) amino) -3-hydroxy-4-oxobutyl) carbamate