6-imino-4-oxo-5-(2-phenylhydrazinyl)naphthalene-2-sulfonic acid

6-amino-4-oxo-3-(phenylhydrazinylidene)naphthalene-2-sulfonic acid

6-二甲氨基-4-羟基-2-萘磺酸

6-(乙基氨基)-4-羟基萘-2-磺酸

4-hydroxy-7-(sulfomethyl-amino)-naphthalene-2-sulfonic acid