138-42-1 4-NITROBENZENESULFONIC ACID 4-Nitrobenzenesulfonate 4-Nitrobenzenesulphonic acid Benzenesulfonic acid, 4-nitro- Benzenesulfonic acid, p-nitro- (8CI) CCRIS 3132 EINECS 205-329-5 NSC 5376 p-Nitrobenzenesulfonic acid p-Nitrophenylsulfonic acid