27583-41-1 Benzenesulfonic acid, 4-(4-((3-ethyl-2(3H)-benzoxazolylidene)ethylidene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- EINECS 248-547-6 p-(4-((3-Ethyl-3H-benzoxazol-2-ylidene)ethylidene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid