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(2S)-4-[(tert-butoxy)carbonyl]-6-oxopiperazine-2-carboxylic acid
(2R)-4-[(tert-butoxy)carbonyl]-6-oxopiperazine-2-carboxylic acid
(2S)-6-oxopiperazine-2-carboxylic acid
tert-butyl (2S)-2-phenylpiperazine-1-carboxylate
tert-butyl (3S)-3-(2-phenylethyl)piperazine-1-carboxylate
tert-butyl (3R)-3-(trifluoromethyl)piperazine-1-carboxylate
tert-butyl (3S)-3-(trifluoromethyl)piperazine-1-carboxylate
tert-butyl (2R,5R)-2,5-dimethylpiperazine-1-carboxylate
tert-butyl (2R,5R)-2,5-diethylpiperazine-1-carboxylate
(2S,6S)-2,6-diethylpiperazine
tert-butyl (3S)-3-[(2S)-butan-2-yl]piperazine-1-carboxylate
(2R)-2-[(3-fluorophenyl)methyl]piperazine
(2R)-2-[(4-fluorophenyl)methyl]piperazine
(2R)-2-{[2-(trifluoromethyl)phenyl]methyl}piperazine
(2R)-2-{[3-(trifluoromethyl)phenyl]methyl}piperazine
(2S)-2-{[4-(trifluoromethyl)phenyl]methyl}piperazine
(2R)-2-{[4-(trifluoromethyl)phenyl]methyl}piperazine
(3S)-3-(2,2,2-trifluoroethyl)piperazin-2-one
(5S)-5-phenylpiperazin-2-one
(6S)-6-phenylpiperazin-2-one
(3S)-3-[(4-fluorophenyl)methyl]piperazin-2-one
2-[(3S)-3-(propan-2-yl)piperazin-1-yl]acetic acid
2-[(2R)-2-(propan-2-yl)piperazin-1-yl]acetic acid
2-[(2S)-2-(propan-2-yl)piperazin-1-yl]acetic acid
2-[(2S)-4-[(tert-butoxy)carbonyl]-2-(propan-2-yl)piperazin-1-yl]acetic acid
2-[(3S)-4-[(tert-butoxy)carbonyl]-3-(2-methylpropyl)piperazin-1-yl]acetic acid
2-[(2R)-2-(2-methylpropyl)piperazin-1-yl]acetic acid
2-[(2R)-4-[(tert-butoxy)carbonyl]-2-(2-methylpropyl)piperazin-1-yl]acetic acid
2-[(3S)-3-benzylpiperazin-1-yl]acetic acid
2-[(3R)-3-benzylpiperazin-1-yl]acetic acid
2-[(2R)-2-benzylpiperazin-1-yl]acetic acid
2-[(2S)-2-benzylpiperazin-1-yl]acetic acid
3-[(3S)-3-methylpiperazin-1-yl]propanoic acid
3-[(3R)-3-methylpiperazin-1-yl]propanoic acid
3-[(3S)-4-[(tert-butoxy)carbonyl]-3-methylpiperazin-1-yl]propanoic acid
3-[(2R)-2-methylpiperazin-1-yl]propanoic acid
3-[(2S)-2-methylpiperazin-1-yl]propanoic acid
3-[(2R)-4-[(tert-butoxy)carbonyl]-2-methylpiperazin-1-yl]propanoic acid
3-[(2S)-4-[(tert-butoxy)carbonyl]-2-methylpiperazin-1-yl]propanoic acid
3-[(3S)-3-(propan-2-yl)piperazin-1-yl]propanoic acid
3-[(3S)-4-[(tert-butoxy)carbonyl]-3-(propan-2-yl)piperazin-1-yl]propanoic acid
3-[(3R)-4-[(tert-butoxy)carbonyl]-3-(propan-2-yl)piperazin-1-yl]propanoic acid
3-[(2R)-2-(propan-2-yl)piperazin-1-yl]propanoic acid
3-[(2R)-4-[(tert-butoxy)carbonyl]-2-(propan-2-yl)piperazin-1-yl]propanoic acid
3-[(3S)-3-phenylpiperazin-1-yl]propanoic acid
3-[(3R)-3-phenylpiperazin-1-yl]propanoic acid
3-[(2R)-2-phenylpiperazin-1-yl]propanoic acid
3-[(2S)-2-phenylpiperazin-1-yl]propanoic acid
3-[(3S)-3-benzylpiperazin-1-yl]propanoic acid
3-[(2R)-2-benzylpiperazin-1-yl]propanoic acid