23236-18-2 3-Thiazolidineacetic acid, 5-[(3-ethyl-2(3H)-benzoxazolylidene)ethylidene]-4-oxo-2-thioxo- 3-Thiazolidineacetic acid, 5-[2-(3-ethyl-2-benzoxazolinylidene)ethylidene]-4-oxo-2-thioxo- NSC104961