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1-(tert-butoxycarbonyl)-5,5-difluoropiperidine-3-carboxylic acid
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1-(tert-butoxycarbonyl)-5,5-difluoropiperidine-2-carboxylic acid
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1-(tert-butoxycarbonyl)-4-methylpiperidine-4-carboxylic acid
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1-(tert-butoxycarbonyl)-4-fluoropiperidine-4-carboxylic acid
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1-(tert-butoxycarbonyl)-4-cyanopiperidine-4-carboxylic acid
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1-(tert-butoxycarbonyl)-3-fluoropiperidine-3-carboxylic acid