2-Chloro-5-nitro-1-toluene-4-sulfonic acid 2-Chloro-5-nitrotoluene-4-sulfonic acid 2-Chloro-5-nitrotoluene-4-sulphonic acid 6973-13-3 Benzenesulfonic acid, 5-chloro-4-methyl-2-nitro- EINECS 230-216-2 NSC 36951