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(6R)-6-methylpiperazin-2-one
6-(propan-2-yl)piperazin-2-one
(6S)-6-(propan-2-yl)piperazin-2-one
(6R)-6-(propan-2-yl)piperazin-2-one
6-(2-methylpropyl)piperazin-2-one
(6S)-6-(2-methylpropyl)piperazin-2-one
(6R)-6-(2-methylpropyl)piperazin-2-one
6-[(methylsulfanyl)methyl]piperazin-2-one
(6R)-6-[(methylsulfanyl)methyl]piperazin-2-one
(6S)-6-[(methylsulfanyl)methyl]piperazin-2-one
6-[2-(methylsulfanyl)ethyl]piperazin-2-one
(6S)-6-[2-(methylsulfanyl)ethyl]piperazin-2-one
(6R)-6-[2-(methylsulfanyl)ethyl]piperazin-2-one
(6S)-6-[(2S)-2-methylbutyl]piperazin-2-one
6-cyclopentylpiperazin-2-one
(6S)-6-cyclopentylpiperazin-2-one
(6R)-6-cyclopentylpiperazin-2-one
6-cyclohexylpiperazin-2-one
(6S)-6-cyclohexylpiperazin-2-one
(6R)-6-cyclohexylpiperazin-2-one
6-phenylpiperazin-2-one
(6S)-6-phenylpiperazin-2-one
(6R)-6-phenylpiperazin-2-one
6-benzylpiperazin-2-one
(6S)-6-benzylpiperazin-2-one
(6R)-6-benzylpiperazin-2-one
6-(2-phenylethyl)piperazin-2-one
(6S)-6-(2-phenylethyl)piperazin-2-one
(6R)-6-(2-phenylethyl)piperazin-2-one
6-[(1H-indol-3-yl)methyl]piperazin-2-one
(6S)-6-[(1H-indol-3-yl)methyl]piperazin-2-one
(6R)-6-[(1H-indol-3-yl)methyl]piperazin-2-one
(3S)-3-phenylpiperazin-2-one
(3R)-3-phenylpiperazin-2-one
(3S)-3-(2-methylphenyl)piperazin-2-one
(3R)-3-(2-methylphenyl)piperazin-2-one
(3S)-3-(3-methylphenyl)piperazin-2-one
(3R)-3-(3-methylphenyl)piperazin-2-one
(3S)-3-(4-methylphenyl)piperazin-2-one
(3R)-3-(4-methylphenyl)piperazin-2-one
3-(4-ethylphenyl)piperazin-2-one
(3S)-3-(4-ethylphenyl)piperazin-2-one
(3R)-3-(4-ethylphenyl)piperazin-2-one
3-[4-(propan-2-yl)phenyl]piperazin-2-one
(3S)-3-[4-(propan-2-yl)phenyl]piperazin-2-one
(3R)-3-[4-(propan-2-yl)phenyl]piperazin-2-one
3-(4-tert-butylphenyl)piperazin-2-one
(3S)-3-(4-tert-butylphenyl)piperazin-2-one
(3R)-3-(4-tert-butylphenyl)piperazin-2-one
3-(2-fluorophenyl)piperazin-2-one