4-[4-[2-(1-ethylnaphtho[1,2-d]thiazol-2(3H)-ylidene)-1-methylethylidene]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl]benzenesulphonic acid

4-[[4-[2-(1-Ethylnaphtho[1,2-d]thiazol-2(1H)-ylidene)-1-methylethylidene]-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol]-1-yl]benzenesulfonic acid