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tert-butyl 4-(hydroxymethyl)piperidine-1-carboxylate
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tert-butyl 4-(difluoromethylene)piperidine-1-carboxylate
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tert-butyl 4-(aminomethyl)-4-hydroxypiperidine-1-carboxylate
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tert-butyl 4-(aminomethyl)-4-fluoropiperidine-1-carboxylate
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tert-butyl 4-(aminomethyl)-4-(2,2,2-trifluoroacetamido)piperidine-1-carboxylate
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tert-butyl 3,3-difluoro-5-(hydroxymethyl)piperidine-1-carboxylate