Naphthalene-2,6-bissulfonic acid, naphthalene-2,6-disulphonic acid, 2,6-naphthale-disulfonic acid, 2,5-DIMETHYL-3'-PIPERIDINOMETHYL BENZOPHENONE, Naphthalene-2,6-disulfonic acid, 2,6-NAPHTHALENE DISULFONIC ACID, 2,6-naphthalenedisulphonic acid, naphthalene-2,6-disulfonate, 2,6-naphthalenedisulfonate, Naphthalin-2,6-disulfonsaeure