4-amino-5-(tosyloxy)naphthalene-2,7-disulfonic acid

1-Amino-8-(4-methylphenylsulfonyloxy)naphthalene-3,6-disulfonic acid

8-Amino-1-(4-methylphenylsulfonyloxy)-3,6-naphthalenedisulfonic acid

4-Amino-5-[[(4-methylphenyl)sulfonyl]oxy]-2,7-naphthalenedisulfonic acid