2-(4-(1,5-Dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-4H-pyrazol-4-ylidene)but-2-enylidene)-3-ethyl-2,3-dihydrobenzoxazole-5-sulphonicacid 4-(4-(3-Ethyl-5-sulfo-2(3H)-benzoxazolylidene)-2-butenylidene)-3-methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one 5-Benzoxazolesulfonic acid, 2-(4-(1,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene)-2-butenylidene)-3-ethyl-2,3-dihydro- 72269-63-7 EINECS 276-557-0