L-Thioproline34592-47-7100 % similar 4-Thiazolidinecarboxylic acid444-27-9100 % similar 3-Thiomorpholinecarboxylic acid20960-92-366 % similar Azetidine-2-carboxylic acid2133-34-848 % similar (±)-2-Azetidinecarboxylic acid2517-04-648 % 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 Pipecolic acid4043-87-244 % similar Hydroxyproline51-35-444 % similar Pipecolic acid535-75-144 % similar cis-4-Hydroxy-L-proline618-27-944 % similar Edds20846-91-742 % similar Dl-lanthionine3183-08-242 % similar (S)-Morpholine-3-carboxylic acid106825-79-041 % similar