2,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-, diazotized, coupled with diazotized 2-((4-aminophenyl)amino)-5-nitrobenzenesulfonic acid, diazotized 4-methoxybenzenamine and 5,5'-oxybis(1,3-benzenediol), sodium salts 97953-05-4 EINECS 308-403-6