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tert-butyl (R)-3-methylpiperazine-1-carboxylate
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tert-butyl (R)-3-(hydroxymethyl)piperazine-1-carboxylate
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tert-butyl (R)-3-(cyanomethyl)piperazine-1-carboxylate
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tert-butyl (R)-2-methylpiperazine-1-carboxylate
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tert-butyl (R)-2-(hydroxymethyl)morpholine-4-carboxylate
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tert-butyl (5,5-difluoropiperidin-3-yl)carbamate