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tert-butyl 4-fluoro-4-(hydroxymethyl)piperidine-1-carboxylate
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tert-butyl 4-amino-4-cyanopiperidine-1-carboxylate
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tert-butyl 4-amino-3,3-difluoropiperidine-1-carboxylate
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tert-butyl 4,4-difluoro-3-hydroxypiperidine-1-carboxylate
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tert-butyl 4-(hydroxymethyl)piperidine-1-carboxylate
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tert-butyl 4-(difluoromethylene)piperidine-1-carboxylate