3-thiazolidineacetic acid, 5-[(4-carboxyphenyl)methylene]-alpha-methyl-4-oxo-2-thioxo-, (5Z)-;4-{(Z)-[3-(1-Carboxyethyl)-4-oxo-2-thioxo-1,3-thiazolidin-5-ylidene]methyl}benzoic acid
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