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((R)-1-acetyl-piperidin-3-yloxy)-acetic acid

((S)-1-acetyl-piperidin-3-yloxy)-acetic acid

(1-Acetyl-piperidin-4-yloxy)-acetic acid

(1-Acetyl-piperidin-2-ylmethoxy)-acetic acid

(1-Acetyl-piperidin-3-ylmethoxy)-acetic acid

(1-Acetyl-piperidin-4-ylmethoxy)-acetic acid

4-[(2-Amino-acetyl)-isopropyl-amino]-piperidine-1-carboxylic acid tert-butyl ester

2-{[(2-Amino-acetyl)-isopropyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

3-{[(2-Amino-acetyl)-isopropyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester

4-{[(2-Amino-acetyl)-isopropyl-amino]-methyl}-piperidine-1-carboxylic acid tert-butyl ester