(R)-3-((S)-2-oxopyrrolidine-5-carbonyl)thiazolidine-4-carboxylic acid; (4R)-3-[(2S)-5-oxopyrrolidine-2-carbonyl]-1,3-thiazolidine-4-carboxylic acid; (R)-3-[[(S)-5-Oxo-2-pyrrolidinyl]carbonyl]-1,3-thiazolidine-4-carboxylic Acid
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