2-NAPHTHALENESULFONIC ACID, 4-HYDROXY-7-(METHYLAMINO)- 22346-43-6 4-Hydroxy-7-(methylamino)naphthalene-2-sulphonic acid 4-Hydroxy-7-methylamino-2-naphthalenesulfonic acid BRN 2656883 EINECS 244-924-4 Kyselina 2-methylamino-5-naftol-7-sulfonova [Czech] Kyselina N-methyl-I [Czech] N-Methyl I acid N-Methyl J acid