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Thiazolidine-2-carboxylic acid16310-13-7100 % similar Thiazolidine-2-carboxylic acid65126-70-7100 % similar Thiomorpholine-3-carboxylic acid20960-92-350 % similar Azetidine-2-carboxylic acid2133-34-843 % similar (±)-2-Azetidinecarboxylic acid2517-04-643 % similar D-Azetidine-2-carboxylic acid7729-30-843 % similar Proline147-85-341 % similar D-Proline344-25-241 % similar DL-Proline609-36-941 % similar (S)-Piperazine-2-carboxylic acid147650-70-239 % similar (+)-Pipecolic acid1723-00-839 % similar Pipecolic acid3105-95-139 % similar (R)-Piperazine-2-carboxylic acid31321-68-339 % similar L-Thioproline34592-47-739 % similar Pipecolic acid4043-87-239 % similar 4-Thiazolidinecarboxylic acid444-27-939 % similar Pipecolic acid535-75-139 % similar Isonipecotic acid498-94-239 % similar Ethylenediamine-N,N'-disuccinic acid20846-91-738 % similar trans-3-Hydroxy-L-proline4298-08-238 % similar