Doxorubicin Impurity 54

10- (((2R,4S,5S,6S) -4-amino-5-hydroxy-6-methyltetrahydro-2H-pyran-2-yl) oxy) -6,8,11-trihydroxy-8- (((2S,3S,4S,6R) -3-hydroxy-2-methyl-6- (((1S,3S,5aS,11aR) -3,5,12-trihydroxy-3- (2-hydroxyacetyl) -10-methoxy-6,11-dioxo-1,2,3,4,5a,6,11,11a-octahydrotetracen-1-yl) oxy) tetrahydro-2H-pyran-4-yl) glycyl) -1-methoxy-7,8,9,10-tetrahydrotetracene-5,12-dione