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(R)-2-Piperazinecarboxylic acid dihydrochloride126330-90-3100 % similar (2S)-Piperazine-2-carboxylic acid dihydrochloride158663-69-5100 % similar Piperazine-2-carboxylic acid dihydrochloride3022-15-9100 % similar (S)-Piperazine-2-carboxylic acid147650-70-288 % similar (R)-Piperazine-2-carboxylic acid31321-68-388 % similar Azetidine-2-carboxylic acid2133-34-853 % similar (±)-2-Azetidinecarboxylic acid2517-04-653 % similar D-Azetidine-2-carboxylic acid7729-30-853 % similar (2R,4S)-4-Hydroxypyrrolidine-2-carboxylic acid hydrochloride142347-81-753 % similar (2R,4R)-4-Hydroxypyrrolidine-2-carboxylic acid hydrochloride77449-94-653 % similar EDDS20846-91-752 % similar Proline147-85-350 % similar D-Proline344-25-250 % similar (4R)-4-Fluoro-L-proline hcl60604-36-650 % similar DL-Proline609-36-950 % similar Oxazolidine-4-carboxylic acid hydrochloride162285-30-549 % similar (+)-Pipecolic acid1723-00-848 % similar Pipecolic acid3105-95-148 % similar Pipecolic acid4043-87-248 % similar Pipecolic acid535-75-148 % similar