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N-Methyl TopiraMate Topiramate Impurity 11 LDHJVCCWWXVXBN-DNJQJEMRSA-N N-methyl Topiramate Impurity TopiraMate N-Methyl IMpurity 2,3:4,5-bis-O-(1-methylethylidene)-β-D-fructopyranose methylsulfamate β-D-Fructopyranose, 2,3:4,5-bis-O-(1-methylethylidene)-, 1-(N-methylsulfamate) Topiramate N-Methyl Impurity/2,3:4,5-bis-O-(1-Methylethylidene)-β-D-fructopyranose 1-(N-methylsulfamate)