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(3R)-3-(2,2,2-trifluoroethyl)piperazin-2-one
(3S)-3-ethylpiperazin-2-one
(3R)-3-ethylpiperazin-2-one
(3S)-3-(propan-2-yl)piperazin-2-one
(3R)-3-(propan-2-yl)piperazin-2-one
3-(2-methylpropyl)piperazin-2-one
(3S)-3-(2-methylpropyl)piperazin-2-one
(3R)-3-(2-methylpropyl)piperazin-2-one
3-[(methylsulfanyl)methyl]piperazin-2-one
(3R)-3-[(methylsulfanyl)methyl]piperazin-2-one
(3S)-3-[(methylsulfanyl)methyl]piperazin-2-one
3-[2-(methylsulfanyl)ethyl]piperazin-2-one
(3S)-3-[2-(methylsulfanyl)ethyl]piperazin-2-one
(3R)-3-[2-(methylsulfanyl)ethyl]piperazin-2-one
(3S)-3-[(2S)-2-methylbutyl]piperazin-2-one
4,7-diazaspiro[2.5]octan-8-one
5,8-diazaspiro[3.5]nonan-9-one
3,3-diethylpiperazin-2-one
5-methylpiperazin-2-one
5-(propan-2-yl)piperazin-2-one
(5S)-5-(propan-2-yl)piperazin-2-one
(5R)-5-(propan-2-yl)piperazin-2-one
5-(2-methylpropyl)piperazin-2-one
(5S)-5-(2-methylpropyl)piperazin-2-one
(5R)-5-(2-methylpropyl)piperazin-2-one
5-[(methylsulfanyl)methyl]piperazin-2-one
(5R)-5-[(methylsulfanyl)methyl]piperazin-2-one
(5S)-5-[(methylsulfanyl)methyl]piperazin-2-one
5-[2-(methylsulfanyl)ethyl]piperazin-2-one
(5S)-5-[2-(methylsulfanyl)ethyl]piperazin-2-one
(5R)-5-[2-(methylsulfanyl)ethyl]piperazin-2-one
(5S)-5-[(2S)-2-methylbutyl]piperazin-2-one
5-cyclopentylpiperazin-2-one
(5S)-5-cyclopentylpiperazin-2-one
(5R)-5-cyclopentylpiperazin-2-one
5-cyclohexylpiperazin-2-one
(5S)-5-cyclohexylpiperazin-2-one
(5R)-5-cyclohexylpiperazin-2-one
5-phenylpiperazin-2-one
(5S)-5-phenylpiperazin-2-one
(5R)-5-phenylpiperazin-2-one
5-benzylpiperazin-2-one
(5S)-5-benzylpiperazin-2-one
(5R)-5-benzylpiperazin-2-one
5-(2-phenylethyl)piperazin-2-one
(5R)-5-(2-phenylethyl)piperazin-2-one
5-[(1H-indol-3-yl)methyl]piperazin-2-one
(5S)-5-[(1H-indol-3-yl)methyl]piperazin-2-one
(5R)-5-[(1H-indol-3-yl)methyl]piperazin-2-one
6-methylpiperazin-2-one