Dapagliflozin Impurity 281

(2S,3R,4R,5S,6R) -2- (4-chloro-3- ((5- (2-chloro-5- ((2S,3R,4R,5S,6R) -3,4,5-trihydroxy-6- (hydroxymethyl) tetrahydro-2H-pyran-2-yl) benzyl) -2-ethoxyphenyl) (4-ethoxyphenyl) methyl) phenyl) -6- (hydroxymethyl) tetrahydro-2H-pyran-3,4,5-triol