Dapagliflozin Ketone Tetraacetate Impurity

: 5-Methoxy Dapagliflozin Tetraacetate; (2R,3R,4R,5S,6S)-2-(acetoxymethyl)-6-(4-chloro-3-(4-ethoxybenzoyl)phenyl)tetrahydro-2H-pyran-3,4,5-triyl triacetate;