Molecule structure of Ditolylbis(azonaphthionic acid) (CAS NO.992-59-6) :

IUPAC Name: disodium 4-amino-3-[4-[4-(1-amino-4-sulfonatonaphthalen-2-yl)diazenyl-3-methylphenyl]-2-methylphenyl]diazenylnaphthalene-1-sulfonate 
Molecular Weight: 724.71638 g/mol
Molecular Formula: C₃₄H₂₆N₆Na₂O₆S₂ 
log P (octanol-water): 3.720 
Atmospheric OH Rate Constant: 2.79E-11 cm³/molecule-sec
H-Bond Donor: 2
H-Bond Acceptor: 12
Rotatable Bond Count: 5
Tautomer Count: 3
Exact Mass: 724.115063
MonoIsotopic Mass: 724.115063
Topological Polar Surface Area: 216
Heavy Atom Count: 50
Complexity: 1250
Canonical SMILES: CC1=C(C=CC(=C1)C2=CC(=C(C=C2)N=NC3=C(C4=CC=CC=C4C(=C3)S(=O)(=O)[O-])N)C)
N=NC5=C(C6=CC=CC=C6C(=C5)S(=O)(=O)[O-])N.[Na+].[Na+]
InChI: InChI=1S/C34H28N6O6S2.2Na/c1-19-15-21(11-13-27(19)37-39-29-17-31(47(41,42)43)23-7-3-5-9-25(23)33(29)35)22-12-14-28(20(2)16-22)38-40-30-18-32(48(44,45)46)24-8-4-6-10-26(24)34(30)36;;/h3-18H,35-36H2,1-2H3,(H,41,42,43)(H,44,45,46);;/q;2*+1/p-2
InChIKey: SUXCALIDMIIJCK-UHFFFAOYSA-L
EINECS: 213-594-3
Product Categories: Organics; Analytical Chemistry; Indicator (pH); pH Indicators 
Colour Index: 23500
Merck: 1101

Reported in EPA TSCA Inventory.

Mutation data reported. When heated to decomposition it emits toxic vapors of NO_x and SO_x.

Analytical Methods:
For occupational chemical analysis use NIOSH: Dyes, 5013.
Hazard Codes:TT
Risk Statements: 45
R45:May cause cancer
Safety Statements: 53-45 
S53:Avoid exposure - obtain special instructions before use.
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible)
WGK Germany: 3
RTECS: QK1765000
F: 8 

For occupational chemical analysis use NIOSH: Dyes, 5013.

 Ditolylbis(azonaphthionic acid) (CAS NO.992-59-6) is also called 1-Naphthalenesulfonic acid, 3,3'-((3,3'-dimethyl(1,1'-diphenyl)-4,4'-diyl)bis(azo))bis(4-amino-, disodium salt ; AI3-62957 ; Amanil purpurine ; Amanil purpurine 4B ; Benzanil purpurine 4B ; Benzopurpurine 4BKX ; C.I. Direct Red 2 disodium salt ; Cerven prima 2 [Czech] ; Chrome Leather Red 4B ; Diaphtamine Purpurine 4B ; Diaphtamine purpurine ; Disodium o-tolidinediazobis(1-naphthylamine-4-sulfonate) ; Eclipse Red ; Erie Benzo 4BP ; Mitsui benzopurpurine 4BX ; NSC 5015 ; Phenamine purpurine 4B ; Purpurin 4B ; Tetrodirect Red 4B .  Ditolylbis(azonaphthionic acid) (CAS NO.992-59-6) is dark red or brown powder. It is stable and incompatible with strong oxidizing agents. Ditolylbis(azonaphthionic acid) is also insoluble in water. Ditolylbis(azonaphthionic acid) is an azo compound. Azo, diazo, azido compounds can detonate. This applies in particular to organic azides that have been sensitized by the addition of metal salts or strong acids. Toxic gases are formed by mixing materials of this class with acids, aldehydes, amides, carbamates, cyanides, inorganic fluorides, halogenated organics, isocyanates, ketones, metals, nitrides, peroxides, phenols, epoxides, acyl halides, and strong oxidizing or reducing agents. Flammable gases are formed by mixing materials in this group with alkali metals. Explosive combination can occur with strong oxidizing agents, metal salts, peroxides, and sulfides. Flash point data for Ditolylbis(azonaphthionic acid) are not available. Ditolylbis(azonaphthionic acid) is probably combustible.