Lactulose Impurity 26

N- ((2S,3R,4R,5S,6R) -2- (((2R,3S,4S,5R,6S) -3,5-dihydroxy-2- (hydroxymethyl) -6- (((2R,3R,4R,5R) -1,2,4,5-tetrahydroxy-6-oxohexan-3-yl) oxy) tetrahydro-2H-pyran-4-yl) oxy) -4-hydroxy-6- (hydroxymethyl) -5- (((2S,3R,4S,5R,6R) -3,4,5-trihydroxy-6- (hydroxymethyl) tetrahydro-2H-pyran-2-yl) oxy) tetrahydro-2H-pyran-3-yl) acetamide