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3-hydroxymethyl-azetidine-1-carboxylic acid tert-butyl ester
Methanesulfonic anhydride
azetidine-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl ester
tert-butyl 3-hydroxyazetidine-1-carboxylate
3-methylene-azetidine-1-carboxylic acid tert-butyl ester