Glycyrrhizic Acid Impurity 28

(2S,3S,4S,5R,6R) -6- (((2S,3R,4S,5S,6S) -6-carboxy-2- (((3S,4S,4aR,6aR,6bS,8aS,11S,12aS,14aR,14bS) -11-carboxy-4- (hydroxymethyl) -4,6a,6b,8a,11,14b-hexamethyl-14-oxo-1,2,3,4,4a,5,6,6a,6b,7,8,8a,9,10,11,12,12a,14,14a,14b-icosahydropicen-3-yl) oxy) -4,5-dihydroxytetrahydro-2H-pyran-3-yl) oxy) -3,4,5-trihydroxytetrahydro-2H-pyran-2-carboxylic acid