31994-53-3 4-(4-(2-(3-Ethyl-2(3H)-benzothiazolylidene)-1-methylethylidene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid Benzenesulfonic acid, 4-(4-(2-(3-ethyl-2(3H)-benzothiazolylidene)-1-methylethylidene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- EINECS 250-885-4