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L-Thioproline34592-47-7100 % similar 4-Thiazolidinecarboxylic acid444-27-9100 % similar Thiomorpholine-3-carboxylic acid20960-92-366 % similar Azetidine-2-carboxylic acid2133-34-848 % similar (±)-2-Azetidinecarboxylic acid2517-04-648 % similar D-Azetidine-2-carboxylic acid7729-30-848 % similar Proline147-85-345 % similar D-Proline344-25-245 % similar DL-Proline609-36-945 % similar 2-Aminothiazoline-4-carboxylic acid2150-55-244 % similar (S)-Piperazine-2-carboxylic acid147650-70-244 % similar (+)-Pipecolic acid1723-00-844 % similar cis-4-Hydroxy-D-proline2584-71-644 % similar Pipecolic acid3105-95-144 % similar (R)-Piperazine-2-carboxylic acid31321-68-344 % similar (2R,4S)-4-Hydroxypyrrolidine-2-carboxylic acid3398-22-944 % similar Pipecolic acid4043-87-244 % similar Hydroxyproline51-35-444 % similar Pipecolic acid535-75-144 % similar cis-4-Hydroxy-L-proline618-27-944 % similar