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(2R,4R)-4-Hydroxypyrrolidine-2-carboxylic acid methyl ester hydrochloride114676-59-447 % similar cis-4-Hydroxy-L-proline methyl ester hydrochloride40126-30-547 % similar 4-Hydroxy-L-proline methyl ester hydrochloride40216-83-947 % similar (2S,4S)-4-Phenylpyrrolidine-2-carboxylic acid hydrochloride90657-53-746 % similar Proline147-85-345 % similar D-Proline344-25-245 % similar DL-Proline609-36-945 % similar Ethyl trans-4-hydroxy-L-prolinate hydrochloride33996-30-445 % similar (R)-2-Piperazinecarboxylic acid dihydrochloride126330-90-344 % similar (2S)-Piperazine-2-carboxylic acid dihydrochloride158663-69-544 % similar Oxazolidine-4-carboxylic acid hydrochloride162285-30-544 % similar Piperazine-2-carboxylic acid dihydrochloride3022-15-944 % similar (+)-Pipecolic acid1723-00-844 % similar Pipecolic acid3105-95-144 % similar L-Thioproline34592-47-744 % similar Pipecolic acid4043-87-244 % similar 4-Thiazolidinecarboxylic acid444-27-944 % similar Pipecolic acid535-75-144 % similar 4-Hydroxycyclohexanecarboxylic acid17419-81-743 % similar trans-4-Hydroxycyclohexanecarboxylic acid3685-22-143 % similar