4-Chloro-3-(4-((4-(dimethylamino)phenyl)methylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzenesulphonic acid 65036-66-0 Benzenesulfonic acid, 4-chloro-3-(4-((4-(dimethylamino)phenyl)methylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)- EINECS 265-319-1