(R)-2-Piperazinecarboxylic acid dihydrochloride126330-90-3100 % similar (S)-Piperazine-2-carboxylic acid147650-70-288 % similar Azetidine-2-carboxylic acid2133-34-853 % similar (±)-2-Azetidinecarboxylic acid2517-04-653 % similar Edds20846-91-752 % similar Proline147-85-350 % similar D-Proline344-25-250 % similar Dl-proline609-36-950 % similar (+)-Pipecolic acid1723-00-848 % similar Pipecolic acid3105-95-148 % similar Pipecolic acid4043-87-248 % similar Pipecolic acid535-75-148 % similar 4-Piperidinecarboxylic acid, hydrochloride (1:1)5984-56-548 % similar (S)-2-Methylpiperazine tartrate126458-15-947 % similar trans-4-Cyclohexyl-L-proline hydrochloride90657-55-946 % similar (S)-Morpholine-3-carboxylic acid106825-79-046 % similar 3-Thiomorpholinecarboxylic acid20960-92-346 % similar (3R)-3-Pyrrolidinecarboxylic acid72580-54-245 % similar cis-4-Hydroxy-D-proline2584-71-644 % similar Hydroxyproline51-35-444 % similar