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METHANESULFONIC ACID 3-BENZOYLAMINO-2-ETHOXY-5-HO-6-HO-ME-4H-PYRAN-4-YL ESTER METHANESULFONIC ACID 3-BENZOYLAMINO-2-ETHOXY-5-HO-6-HO-ME-4H-PYRAN-4-YL ESTER