Gentamicin Nitroso Impurity 21

N- (((2S,5R,6R) -5-amino-6- (((1R,2S,3S,4R,6S) -4,6-diamino-3- (((2R,3R,4R,5R) -3,5-dihydroxy-5-methyl-4- (methylamino) tetrahydro-2H-pyran-2-yl) oxy) -2-hydroxycyclohexyl) oxy) tetrahydro-2H-pyran-2-yl) methyl) -N-methylnitrous amide