2,4-Diaminobenzenesulfonic acid, sodium salt 3177-22-8 88-63-1 Benzenesulfonic acid, 2,4-diamino-, monosodium salt Benzenesulfonic acid, 2,4-diamino-, sodium salt EINECS 221-650-3 Monosodium 2,4-diaminobenzenesulfonate Sodium 2,4-diaminobenzenesulfonate Sodium 2-aminosulphanilate