1(4H)-Quinolinepropanesulfonic acid, 4-(4-(3-ethyl-4-oxo-2-thioxo-5-thiazolidinylidene)-2-butenylidene)-, sodium salt 5-((1-gamma-Sodium sulfopropyl-4(1H)-quinolylidene)-2-butenylidene)-3-ethylrhodanine 68107-18-6 Merocyanine-rhodanine NK-2495