Synonyms: 2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-[(4-nitrophenyl)azo]-, diazotized, coupled with diazotized 2-amino-4,6-dinitrophenol, diazotized 4-amino-5-hydroxy-2,7-naphthalenedisulfonic acid, diazotized 4-nitrobenzenamine and resorci