[(4-hydroxyphenyl)azo]phenylamino-3-nitrobenzenesulfonate

sodium 4-[4-(4-hydroxyphenylazo)phenylamino]-3-nitrobenzenesulfonate

4-[4-(4-Hydroxyphenylazo)phenylamino]-3-nitrobenzenesulfonic acid, sodium salt

Benzenesulfonic acid, 4-4-(4-hydroxyphenyl)azophenylamino-3-nitro-, sodium salt