1,3,6-Naphthalenetrisulfonic acid, 8-amino- 1-Naphthylamine, 3,6,8-trisulfo- 117-42-0 79873-38-4 8-Amino-1,3,6-naphthalenetrisulfonic acid 8-Aminonaphthalene-1,3,6-trisulphonic acid 901-79-1 EINECS 204-188-7 Koch acid Koch's acid NSC 227195