5-[2-[3-Ethylbenzoxazol-2(3H)-ylidene]-1-methylethylidene]-4-oxo-2-thioxo-3-oxazolidinepropane-1-sulfonic acid

5-[2-(3-ethyl-2(3H)-benzoxazol-1-ylidene)-1-methylethylidene]-4-oxo-2-thioxo-3-oxazolidinepropionosulphonic acid