2-((1,5-Dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-4H-pyrazol-4-ylidene)ethylidene)-3-ethyl-2,3-dihydrobenzoxazole-5-sulphonic acid 4-(2-(3-Ethyl-5-sulfo-2(3H)-benzoxazolylidene)ethylidene)-3-methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one 5-Benzoxazolesulfonic acid, 2-((1,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene)ethylidene)-3-ethyl-2,3-dihydro- 71042-69-8 EINECS 275-153-1