IUPAC Name: tetrasodium 3-[4-[4-[(2E)-2-(6-amino-1-oxo-3-sulfonatonaphthalen-2-ylidene) hydrazinyl]-6-sulfonatonaphthalen-1-yl]diazenylnaphthalen-1-yl] diazenylnaphthalene-1,5-disulfonate 
Empirical Formula: C₄₀H₂₃N₇Na₄O₁₃S₄
Molecular Weight: 1029.8688g/mol
EINECS: 224-531-4
Structure of 1,5-Naphthalenedisulfonicacid,3-[2-[4-[2-[4-[2-(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)diazenyl]-6-sulfo-1-naphthalenyl]diazenyl]-1-naphthalenyl]diazenyl]-,sodium salt (1:4) (CAS NO.4399-55-7):

Physical Appearance: black powder
H bond acceptors: 20
H bond donors: 7
Freely Rotating Bonds: 11
Polar Surface Area: 336.35Ų
Product Categories: Dyes and Pigments;Organics;D;Stains and Dyes;Stains&Dyes, A to 
Canonical
SMILES: C1=CC=C2C(=C1)C(=CC=C2N=NC3=CC(=C4C=CC=C(C4=C3)S(=O)(=O)[O-])S(=O)(=O)
[O-])N=NC5=C6C=CC(=CC6=C(C=C5)NN=C7C(=CC8=C(C7=O)C=CC(=C8)N)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+].[Na+].[Na+]
Isomeric SMILES: C1=CC=C2C(=C1)C(=CC=C2N=NC3=CC(=C4C=CC=C(C4=C3)S(=O)(=O)[O-])S(=O)(=O)
[O-])N=NC5=C6C=CC(=CC6=C(C=C5)N/N=C\7/C(=CC8=C(C7=O)C=CC(=C8)N)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+].[Na+].[Na+]
InChI: InChI=1S/C40H27N7O13S4.4Na/c41-22-8-10-25-21(16-22)17-38(64(58,59)60)39(40(25)48)47-46-35-15-14-34(28-11-9-24(20-30(28)35)61(49,50)51)45-44-33-13-12-32(26-4-1-2-5-27(26)33)43-42-23-18-31-29(37(19-23)
63(55,56)57)6-3-7-36(31)62(52,53)54;;;;/h1-20,46H,41H2,(H,49,50,51)(H,52,53,54)(H,55,56,57)(H,58,59,60);;;;/q;4*+1/p-4/b43-42?,45-44?,47-39-;;;;
InChIKey: OAYAFVUUUYMNOP-PLUAUMMZSA-J

Safety Statements: 24/25
S24/25:Avoid contact with skin and eyes.
WGK Germany: 3

  Direct Blue 71 , with CAS number of 4399-55-7, can be called 1,5-Naphthalenedisulfonicacid,3-[[4-[[4-[(6-amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]-6-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-,tetrasodium salt (9CI) ; C.I. Direct Blue 71 (7CI) ; Chlorantine Fast Blue FFC ; Dialuminous Blue BRR ; Diaphtamine Blue FFL ; Diphenyl Fast Blue GLN ; Direct Lightfast Navy Blue ; FastusolBlue LBRRA ; Helion Blue BRRL ; Pyrazol Fast Blue BS ; Solamine Fast Blue BRR .