3(2H)-BENZOXAZOLEPROPANESULFONIC ACID, 2-(4-(1,3-DIBUTYLTETRAHYDRO-4,6-DIOXO-2-T 3(2H)-Benzoxazolepropanesulfonic acid, 2-(4-(1,3-dibutyltetrahydro-4,6-dioxo-2-thioxo-5(2H)-pyrimidinylidene)-2-butenylidene)-, sodium salt 62796-23-0 MC 540 Merocyanine 540 NK 2272