2-amino-4-oxo-4,5-dihydro-thiazole-5-carboxylic acid ethyl ester;2-Amino-4-oxo-4,5-dihydro-thiazol-5-carbonsaeure-aethylester;ethyl 2-amino-4-oxo-4,5-dihydro-1,3-thiazole-5-carboxylate;
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