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L-Thioproline34592-47-733 % similar 4-Thiazolidinecarboxylic acid444-27-933 % similar Djenkolic acid498-59-933 % similar N,N′-Diacetyl-L-cystine5545-17-533 % similar Carbocisteine638-23-333 % similar 1-[(tert-Butoxy)carbonyl]azetidine-2-carboxylic acid159749-28-733 % similar Boc-D-azetidine-2-carboxylic acid228857-58-733 % similar 1-Boc-L-azetidine-2-carboxylic acid51077-14-633 % similar N-Acetylprolinamide16395-58-733 % similar S-Methylcysteine1187-84-433 % similar Fudosteine13189-98-532 % similar 1-(2-Chloroacetyl)-L-proline23500-10-932 % similar 1-Methylpiperidine-2-carboxylic acid hydrochloride25271-35-632 % similar Thiomorpholine-3-carboxylic acid20960-92-332 % similar 1-(3-Hydroxy-1-azetidinyl)ethanone118972-96-632 % similar D-Cystine349-46-232 % similar Cystine56-89-332 % similar 2-Azaniumyl-3-((2-azaniumyl-2-carboxylatoethyl)disulfanyl)propanoate923-32-032 % similar Boc-L-proline15761-39-431 % similar (2R)-1-[(tert-Butoxy)carbonyl]pyrrolidine-2-carboxylic acid37784-17-131 % similar