1H-Pyrazolium, 5-((4-(diethylamino)phenyl)azo)-2-(2-hydroxyethyl)-1-(phenylmethyl)-, (T-4)-tetrachlorozincate(2-) (2:1) 51733-03-0 Bis(1-benzyl-5-((4-(diethylamino)phenyl)azo)-2-(2-hydroxyethyl)-1H-pyrazolium) tetrachlorozincate EINECS 257-366-1