5-[(3-benzylbenzoxazol-2(3H)-ylidene)ethylidene]-4-oxo-2-thioxothiazolidin-3-acetic acid;4-Oxo-5-[2-[3-phenylmethylbenzoxazol-2(3H)-ylidene]ethylidene]-2-thioxo-3-thiazolidineacetic acid
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