| 177159-56-7 | 2,7-Naphthalenedisulfonicacid,5-[2-[2,4-dihydroxy-5-[2-(4-nitrophenyl)diazenyl]-3-[2-[4-(phenylamino)-3-sulfophenyl]diazenyl]phenyl]diazenyl]-4-hydroxy-3-[2-[4-(phenylamino)-3-sulfophenyl]diazenyl]-,sodium salt (1:4) | C46H33 N11 O17 S4 . 4 Na |