(mu-((3,3'-(Methylenebis((4,6-dihydroxy-m-phenylene)azo))bis(4-hydroxy-5-nitrobenzenesulphonato))(6-)))diiron dihydrochloride 73297-21-9 73507-62-7 EINECS 277-369-1 Iron, (mu-((3,3'-(methylenebis((4-hydroxy-6-(hydroxy-kappaO)-3,1-phenylene)azo-kappaN1))bis(4-(hydroxy-kappaO)-5-nitrobenzenesulfonato))(6-)))di-, dihydrochloride