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p-[3-Carboxy-4-[p-(dimethylamino)cinnamylidene]-5-oxo-2-pyrazolin-1-yl]benzenesulfonic acid 1-sodium salt Structure

p-[3-Carboxy-4-[p-(dimethylamino)cinnamylidene]-5-oxo-2-pyrazolin-1-yl]benzenesulfonic acid 1-sodium salt