1-Piperidinecarboxylic acid, 3,3-difluoro-4-oxo-, 1,1-diMethylethyl ester
1-Piperidinecarboxylic acid, 3,3-difluoro-4-oxo-, 1,1-diMethylethyl ester;tert-Butyl 3,3-difluoro-4-oxopiperidin-1-carboxylate hydrate;tert-Butyl 3,3-difluoro-4-oxopiperidine-1-carboxylate hydrate