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(S)-1-Boc-2-isopropylpiperazine674792-05-361 % similar 1,1-Dimethylethyl (2R)-2-ethyl-1-piperazinecarboxylate393781-70-960 % similar 1-(1,1-Dimethylethyl) (2S)-4-oxo-1,2-pyrrolidinedicarboxylate84348-37-858 % similar 1-(tert-Butoxycarbonyl)-4-oxopyrrolidine-2-carboxylic acid876317-19-058 % similar 1,1-Dimethylethyl (2S)-2-(2-methylpropyl)-1-piperazinecarboxylate674792-06-457 % similar 1-(1,1-Dimethylethyl) (2S)-4,4-dimethyl-1,2-pyrrolidinedicarboxylate1001353-87-257 % similar (2S,4S)-N-Boc-4-methylpyrrolidine-2-carboxylic acid364750-81-257 % similar (S)-5-Boc-5-azaspiro[2.4]heptane-6-carboxylic acid1129634-44-155 % similar N-Boc-cis-4-hydroxy-D-proline135042-12-555 % similar 1-(1,1-Dimethylethyl) (2S,4R)-4-hydroxy-1,2-pyrrolidinedicarboxylate13726-69-755 % similar (2R,4S)-N-Alpha-T-butoxycarbonyl-4-hydroxypyrrolidine-2-carboxylic acid147266-92-055 % similar (S)-4-Methylene-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester84348-38-955 % similar N-Boc-cis-4-hydroxy-L-proline87691-27-855 % similar (2S,4S)-1-((tert-Butoxy)carbonyl)-4-fluoropyrrolidine-2-carboxylic acid203866-13-154 % similar (2S,4R)-1-[(tert-Butoxy)carbonyl]-4-fluoropyrrolidine-2-carboxylic acid203866-14-254 % similar (2S)-1-[(tert-Butoxy)carbonyl]-4,4-difluoropyrrolidine-2-carboxylic acid203866-15-354 % similar (2R,4S)-1-(tert-Butoxycarbonyl)-4-fluoropyrrolidine-2-carboxylic acid681128-50-754 % similar (2R,4R)-1-[(tert-Butoxy)carbonyl]-4-fluoropyrrolidine-2-carboxylic acid681128-51-854 % similar 1,1-Dimethylethyl (2S)-2-(phenylmethyl)-1-piperazinecarboxylate169447-86-352 % similar 1,1-Dimethylethyl 2-(phenylmethyl)-1-piperazinecarboxylate481038-63-552 % similar