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The electron-impact (EI) mass spectral fragmentation of ten bis-O-(l-methylethy1idene)fructopyranose derivatives and three related sugar sulfamates were investigated. and OH. The fragmentation of isomeric bis-O-(l-methylethylidene) derivatives of aldopyranose, ketopyranose and ketofuranose sulfamates was also investigated. The results indicate that isomeric sugar sulfamates can be easily distinguished in the EI mode. Key fragmentation pathways are discussed for these compounds.

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