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2-Aminothiazoline-4-carboxylic acid2150-55-2100 % similar L-Thioproline34592-47-744 % similar 4-Thiazolidinecarboxylic acid444-27-944 % similar Carbamoyl aspartic acid923-37-543 % similar Thiomorpholine-3-carboxylic acid20960-92-342 % similar Carbamylglutamic acid1188-38-141 % similar Azetidine-2-carboxylic acid2133-34-839 % similar (±)-2-Azetidinecarboxylic acid2517-04-639 % similar D-Azetidine-2-carboxylic acid7729-30-839 % similar Allantoic acid99-16-139 % similar (S)-6-Oxo-2-piperidinecarboxylic acid34622-39-438 % similar Boc-cys(tbu)-oh56976-06-838 % similar Proline147-85-337 % similar D-Proline344-25-237 % similar DL-Proline609-36-937 % similar Glycyl-D-asparagine24667-21-837 % similar (S)-Piperazine-2-carboxylic acid147650-70-236 % similar (+)-Pipecolic acid1723-00-836 % similar cis-4-Hydroxy-D-proline2584-71-636 % similar Pipecolic acid3105-95-136 % similar