Molecule structure of C.I. Direct Brown (CAS NO.16071-86-6):

IUPAC Name: Copper disodium 2-oxido-5-[4-[4-[(2E)-2-[(5E)-5-[(2-oxido-5-sulfonatophenyl)hydrazinylidene]-2,
6-dioxocyclohex-3-en-1-ylidene]hydrazinyl]phenyl]phenyl]diazenylbenzoate 
Molecular Weight: 760.09996 g/mol
Molecular Formula: C₃₁H₁₈CuN₆Na₂O₉S
H-Bond Donor: 2
H-Bond Acceptor: 15
Rotatable Bond Count: 7
Tautomer Count: 17
Exact Mass: 758.994737
MonoIsotopic Mass: 758.994737
Topological Polar Surface Area: 251
Heavy Atom Count: 50
Complexity: 1380
Canonical SMILES: C1=CC(=CC=C1C2=CC=C(C=C2)N=NC3=CC(=C(C=C3)[O-])C(=O)[O-])NN=C4C(=O)=CC
(=NNC5=C(C=CC(=C5)S(=O)(=O)[O-])[O-])C4=O.[Na+].[Na+].[Cu+2]
Isomeric SMILES: C1=CC(=CC=C1C2=CC=C(C=C2)N=NC3=CC(=C(C=C3)[O-])C(=O)[O-])N/N=C/4\C(=O)C=C/C(=N\NC5=C(C=CC(=C5)S(=O)(=O)[O-])[O-])/C4=O.[Na+].[Na+].[Cu+2]
InChI: InChI=1S/C31H22N6O9S.Cu.2Na/c38-26-12-9-21(15-23(26)31(42)43)34-32-19-5-1-17(2-6-19)18-3-7-20(8-4-18)33-37-29-28(40)14-11-24(30(29)41)35-36-25-16-22(47(44,45)46)10-13-27(25)39;;;/h1-16,33,36,38-39H,(H,42,43)(H,44,45,46);;;/q;+2;2*+1/p-4/b34-32?,35-24+,37-29+;;;
InChIKey: YSIIVKXVQXRKAN-FFLLBNMPSA-J
EINECS: 240-221-1
Product Categories: Organometallics

 C.I. Direct Brown (CAS NO.16071-86-6) is mainly used for dyeing of cotton fabrics.

IARC Cancer Review: Animal Limited Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 29 , 1982,p. 321.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Limited Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 29 , 1982,p. 321.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; NCI Carcinogenesis Bioassay (feed); Clear Evidence: rat NCITR*    National Cancer Institute Carcinogenesis Technical Report Series. (Bethesda, MD 20014) No. NCI-CG-TR-108 ,1978. ; No Evidence: mouse NCITR*    National Cancer Institute Carcinogenesis Technical Report Series. (Bethesda, MD 20014) No. NCI-CG-TR-108 ,1978. . Reported in EPA TSCA Inventory. Community Right-To-Know List.

Low toxicity by ingestion. Suspected carcinogen with experimental carcinogenic and neoplastigenic data. Mutation data reported. When heated to decomposition it emits very toxic fumes of Na₂O, SO_x, and NO_x.
Hazard Codes: T
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.)

For occupational chemical analysis use NIOSH: Dyes, 5013.

 C.I. Direct Brown (CAS NO.16071-86-6) is also named as Aizen Primula Brown BRLH ; Aizen Primula Brown PLH ; Amanil Fast Brown BRL ; Amanil Supra Brown LBL ; Atlantic Fast Brown BRL ; Brown 4EMBL ; C.I. 30145 ; C.I. Direct Brown 95 ; CCRIS 168 ; CI 30145 ; Calcodur Brown BRL ; Chloramine Fast Brown BRL ; Cuprate(2-),(5-((4'-((2,6-dihydroxy-3-((2-hydroxy-5-sulfophenyl)azo)phenyl)azo)(1,1'-biphenyl)-4-yl)azo)-2-hydroxybenzoato(4-)), disodium ; Cuprofix Brown GL ; Direct Brown BRL ; Direct Fast Brown BRL ; Fastusol Brown LBRSA ; Fastusol Brown LBRSN ; Fenaluz Brown BRL ; Pontamine Fast Brown BRL ; Pontamine Fast Brown NP ; Pyrazol Fast Brown BRL ; Sumilight Supra Brown BRS ; Suprazo Brown BRL ; Suprexcel Brown BRL ; Tertrodirect Fast Brown BR ; Tetramine Fast Brown BRDN Extra ; Tetramine Fast Brown BRP .  C.I. Direct Brown (CAS NO.16071-86-6) is a dark brown microcrystals or charcoal black powder. It is slightly water soluble. It is an azo compound. Azo dyes can be explosive when suspended in air at specific concentrations. . Toxic gases are formed by mixing azo compounds 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. However, it is probably combustible.