、
钠 、
1-Amino-8-hydroxy-2-(2',5'-dihydroxysulfonylphenylazo)naphthalene-3,6-disulfonic acid 以
水 为溶剂,
以obtained by strongly acid coupling of diazotized aniline-2,5-disulfonic acid to 1-amino-8-hydroxynaphthalene-3,6-disulfonic acid) in 300 ml of water的产率得到2-氨基-1,4-苯二磺酸