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Azetidine-2-carboxylic acid2133-34-8100 % similar (±)-2-Azetidinecarboxylic acid2517-04-6100 % similar D-Azetidine-2-carboxylic acid7729-30-8100 % similar Proline147-85-375 % similar D-Proline344-25-275 % similar DL-Proline609-36-975 % similar (+)-Pipecolic acid1723-00-872 % similar Pipecolic acid3105-95-172 % similar Pipecolic acid4043-87-272 % similar Pipecolic acid535-75-172 % similar (2R,4R)-4-Methylpiperidine-2-carboxylic acid74892-81-264 % similar (S)-Piperazine-2-carboxylic acid147650-70-259 % similar (R)-Piperazine-2-carboxylic acid31321-68-359 % similar Ethylenediamine-N,N'-disuccinic acid20846-91-757 % similar (S)-Morpholine-3-carboxylic acid106825-79-055 % similar Thiomorpholine-3-carboxylic acid20960-92-355 % similar 3-Morpholinecarboxylic acid77873-76-855 % similar (R)-2-Piperazinecarboxylic acid dihydrochloride126330-90-353 % similar (2S)-Piperazine-2-carboxylic acid dihydrochloride158663-69-553 % similar Piperazine-2-carboxylic acid dihydrochloride3022-15-953 % similar