2-((1,5-Dihydro-3-methyl-5-oxo-1-(4-sulphophenyl)-4H-pyrazol-4-ylidene)ethylidene)-3-ethyl-2,3-dihydrobenzoxazolesulphonic acid 34383-51-2 Benzoxazolesulfonic acid, 2-((1,5-dihydro-3-methyl-5-oxo-1-(4-sulfophenyl)-4H-pyrazol-4-ylidene)ethylidene)-3-ethyl-2,3-dihydro- EINECS 251-984-5