sodium,4-[(4Z)-4-[[4-(dimethylamino)phenyl]methylidene]-3-methyl-5-oxopyrazol-1-yl]benzenesulfonate; Benzenesulfonic acid,4-(4-((4-(dimethylamino)phenyl)methylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-,sodium salt (1:1); Benzenesulfonic acid,4-(4-((4-(dimethylamino)phenyl)methylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-,sodium salt; 4-((4-(Dimethylamino)phenyl)methylene)-3-methyl-1-(4-sulfophenyl)-2-pyrazoline-5-one,sodium salt