2,7-Naphthalenedisulfonic acid, 4-(bis(4-(diethylamino)phenyl)methyl)- 4-(Bis(4-(diethylamino)phenyl)methyl)-2,7-naphthalenedisulfonic acid 4-(Bis(4-(diethylamino)phenyl)methyl)naphthalene-2,7-disulphonic acid 4-(Bis(p-(diethylamino)phenyl)methyl)-2,7-naphthalenedisulfonic acid 67828-32-4 67906-62-1 EINECS 267-254-4