121-18-6 2-Nitrochlorobenzene-4-sulfonic acid 4-Chloro-3-nitrobenzenesulfonic acid 4-Chloro-3-nitrobenzenesulphonic acid Benzenesulfonic acid, 4-chloro-3-nitro- EINECS 204-452-1 NSC 7827 o-Nitrochlorobenzene-p-sulfonic acid