2,2'-((2,4-Dihydroxy-1,3-phenylene)bis(azo-4,1-phenyleneimino))bis(5-nitrobenzenesulphonic) acid 2,2'-(2,6-Dihydroxy-1,3-phenylene-bis(azo-4-phenylamino)-5,5'-dinitro)-dibenzensulfonic acid 78265-88-0 Benzenesulfonic acid, 2,2'-((2,4-dihydroxy-1,3-phenylene)bis(azo-4,1-phenyleneimino))bis(5-nitro- EINECS 278-876-0