64789-21-5

2,3,4-Trihydroxy-4'-sulfoazobenzene 2,3,4-Trihydroxyazobenzene-4'-sulfonic acid 4-(2,3,4-Trihydroxyphenylazo)benzenesulfonic acid Benzenesulfonic acid, 4-[2-(2,3,4-trihydroxyphenyl)diazenyl]-