Synonyms: 2,7-Naphthalenedisulfonicacid, 4-[[2,4-dihydroxy-5-[(2-hydroxy-3,5-dinitrophenyl)azo]-3-[(4-nitrophenyl)azo]phenyl]azo]-5-hydroxy-, ironcomplex (9CI); Iron, 4-[[2,4-dihydroxy-5-[(2-hydroxy-3,5-dinitrophenyl)azo]-3-[(4-nitrophenyl)azo]phenyl]azo]-5-hydroxy-2,7-naphthalenedisulfonic acid complex(9CI); Acid Brown 216; C.I. 34906; Covalene Brown ERY