... ,5-NAPHTHALENE DISULFONIC ACID 1,5-NAPHTHALENE DISULFONIC ACID SODIUM SALT(1,5-NDS)1,6-CLEVES ACID1,6-NAPHTHALENE DISULFONIC ACID SODIUM SALT(1,6-NDS ... ,3- ACID2,6-NAPHTHALENE DISULFONIC ACID SODIUM SALT(2,6-NDS)2,7-DIHYDROXY NAPHTHALENE2,7-NAPHTHALENE DISULFONIC ACID SODIUM SALT(2,7-NDS)2-NAPHTHOL4 ...