2-(4-(4-((4-(Bis(2-cyanoethyl)amino)phenyl)methylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)phenyl)-6-methylbenzothiazole-7-sulphonic acid, compound with pyridine (1:1) 84100-40-3 EINECS 282-120-5