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METHANESULFONIC ACID 3-ACETYLAMINO-6-AZIDOMETHYL-5-HO-2-MEO-4H-PYRAN-4-YL ESTER METHANESULFONIC ACID 3-ACETYLAMINO-6-AZIDOMETHYL-5-HO-2-MEO-4H-PYRAN-4-YL ESTER