2-Nitroaniline-4-sulfonic acid 4-Amino-3-nitrobenzenesulfonic acid 4-Amino-3-nitrobenzenesulphonic acid 616-84-2 Benzenesulfonic acid, 4-amino-3-nitro- EINECS 210-495-7 NSC 39866 NSC 51813 Sulfanilic acid, 3-nitro- (8CI) o-Nitroaniline-p-sulfonic acid