1,3-Diethylurea supplier | CasNO.623-76-7

Name
1,3-Diethylurea
EINECS 210-811-3
CAS No. 623-76-7
Article Data52
CAS DataBase
Density 0.923 g/cm³
Solubility Soluble in water.
Melting Point 112-113 °C(lit. )
Formula C₅H₁₂N₂O
Boiling Point 263 °C at 760 mmHg
Molecular Weight 116.163
Flash Point 121.1 °C
Transport Information
Appearance
Safety 22-24/25-36/37/39-15-3/7/9
Risk Codes 11-23/24/25-36/37/38
Molecular Structure
Hazard Symbols F, T
Synonyms Urea,1,3-diethyl- (6CI,7CI,8CI);1,3-Diethylurea;N,N'-Diethylurea;NSC 429;sym-Diethylurea;
PSA 41.13000
LogP 1.10720

Synthetic route

: 75-04-7
ethylamine

: 39076-43-2
S-methyl N-ethylthiocarbamate

A: 74-93-1
methylthiol

B: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
In water at 40℃; for 8h;	A n/a B 100%

...Expand

: 109-90-0
ethyl isocyanate

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With water; triethylamine In 1,4-dioxane at 20℃; for 0.05h;	98.5%
With Ta(η5-C5Me5)(η3-1-phenylallyl)2 In toluene for 12h; Ambient temperature;	63%
durch Zersetzung mit Wasser;
With hydrogen sulfide

: 868-84-8
S,S-dimethyl dithiocarbonate

: 75-04-7
ethylamine

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
In water at 60℃; for 5h;	96%
at 100℃;

: 201230-82-2
carbon monoxide

: 6667-19-2
benzenenesulfenyl dimethylamine

A: 623-76-7
N,N'-diethylurea

B: 14288-05-2
N,N,N',N'-tetraethyloxamide

C: 109-89-7
diethylamine

D: diethylthiocarbamic acid S-phenyl ester

Conditions

Conditions	Yield
With tetrakis(triphenylphosphine) palladium(0) In pyridine at 80℃; under 14701.2 Torr; for 10h; Carbonylation;	A n/a B 1.4 % Spectr. C 3 % Spectr. D 90%

...Expand

: 75-04-7
ethylamine

: 57-13-6
urea

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With cerium(III) chloride; potassium iodide In water for 0.0666667h; microwave irradiation;	87%
at 140 - 150℃; Neat (no solvent);

: 201230-82-2
carbon monoxide

: N,N-diethyl-S-(3-methoxy-phenyl)-thiohydroxylamine

A: 623-76-7
N,N'-diethylurea

B: 14288-05-2
N,N,N',N'-tetraethyloxamide

C: 109-89-7
diethylamine

D: diethyl-thiocarbamic acid S-(3-methoxy-phenyl) ester

Conditions

Conditions	Yield
With tetrakis(triphenylphosphine) palladium(0) In pyridine at 80℃; under 14701.2 Torr; for 3h; Carbonylation;	A n/a B 1.4 % Spectr. C 3 % Spectr. D 81%

...Expand

: 593-77-1
N-Methylhydroxylamine

: 109-90-0
ethyl isocyanate

A: 28145-10-0
1-ethyl-3-methylurea

B: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
Stage #1: N-Methylhydroxylamine; ethyl isocyanate With magnesium oxide In acetone at 20℃; for 0.166667h; Stage #2: for 0.0583333h; Microwave irradiation; neat (no solvent);	A 74% B 10%

...Expand

: N-ethyl-2-(3-methylbenzo[d]thiazol-2(3H)-ylidene)hydrazinecarboxamide

A: 623-76-7
N,N'-diethylurea

B: 13545-63-6
1,2-bis(3-methylbenzo[d]thiazol-2(3H)-ylidene)hydrazine

Conditions

Conditions	Yield
at 220℃; under 0.5 Torr; for 0.5h;	A 73% B 67%

: 100-65-2
N-Phenylhydroxylamine

: 109-90-0
ethyl isocyanate

A: 623-76-7
N,N'-diethylurea

B: 621-04-5
1-ethyl-3-phenylurea

Conditions

Conditions	Yield
Stage #1: N-Phenylhydroxylamine; ethyl isocyanate With magnesium oxide In acetone at 20℃; for 0.166667h; Stage #2: for 0.0666667h; Microwave irradiation; neat (no solvent);	A 9% B 72%

...Expand

: 7098-07-9
N-Ethylimidazole

: 935-02-4
2-cyano-1-phenylacetylene

: 109-90-0
ethyl isocyanate

A: 623-76-7
N,N'-diethylurea

B: 1415219-02-1
N-[(Z)-2-cyano-1-phenylethenyl]-N,1-diethyl-1H-imidazole-2-carboxamide

Conditions

Conditions	Yield
In neat (no solvent) at 20 - 25℃; for 48h; Green chemistry; stereoselective reaction;	A 31% B 65%

...Expand

: 616-47-7
1-methyl-1H-imidazole

: 935-02-4
2-cyano-1-phenylacetylene

: 109-90-0
ethyl isocyanate

A: 623-76-7
N,N'-diethylurea

B: 1079368-39-0
(Z)-3-(1-methyl-1H-imidazol-2-yl)-3-phenyl-2-propenenitrile

C: 1415219-01-0
N-[(Z)-2-cyano-1-phenylethenyl]-N-ethyl-1-methyl-1H-imidazole-2-carboxamide

Conditions

Conditions	Yield
In neat (no solvent) at 20 - 25℃; for 24h; Green chemistry; stereoselective reaction;	A 33% B 10% C 50%

...Expand

: 109-90-0
ethyl isocyanate

A: 623-76-7
N,N'-diethylurea

B: 101981-15-1
C6H12N2O2

Conditions

Conditions	Yield
With hydrogen; In tetrahydrofuran at 120℃; under 37503 Torr; for 40h;	A n/a B 41%

: 67-56-1
methanol

: 201230-82-2
carbon monoxide

: 75-04-7
ethylamine

A: 6135-31-5
methyl N-ethylcarbamate

B: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With dichloro bis(acetonitrile) palladium(II); triethylamine under 760 Torr; for 4h; Ambient temperature;	A 37% B 18%

...Expand

: 201230-82-2
carbon monoxide

: 75-04-7
ethylamine

A: 6135-31-5
methyl N-ethylcarbamate

B: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With dichloro bis(acetonitrile) palladium(II); triethylamine In methanol under 760 Torr; for 4h; Ambient temperature;	A 37% B 18%

...Expand

: 935-02-4
2-cyano-1-phenylacetylene

: 31410-01-2
1-allylimidazole

: 109-90-0
ethyl isocyanate

A: 623-76-7
N,N'-diethylurea

B: 1079368-45-8
(Z)-3-(1-allyl-1H-imidazol-2-yl)-3-phenyl-2-propenenitrile

C: 1415219-03-2
1-allyl-N-[(Z)-2-cyano-1-phenylethenyl]-N-ethyl-1H-imidazole-2-carboxamide

Conditions

Conditions	Yield
In neat (no solvent) at 20 - 25℃; for 24h; Green chemistry; stereoselective reaction;	A 31% B 37% C 28%

...Expand

: 67-66-3
chloroform

: 557-66-4
ethanamine hydrochloride

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With oxygen; sodium hydroxide In water at 10℃; for 5h; Irradiation;	14%

: 7139-74-4
propionyl azide

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With ethanol

: 18804-23-4
ethylcarbamic 2-hydroxyethylester

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
beim Erhitzen;

: C8H17N3O2

A: 623-76-7
N,N'-diethylurea

B: 109-90-0
ethyl isocyanate

: 39938-75-5
N',N'''-diethyl-N,N''-m-phenylene-di-urea

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
at 230℃;

: 871876-66-3
N-ethyl-N'-biphenyl-4-yl-urea

A: 623-76-7
N,N'-diethylurea

B: 95745-38-3
1,3-di([1,1'-biphenyl]-4-yl)urea

Conditions

Conditions	Yield
at 290℃;

: 19708-81-7
methyl O-methyldithiocarbonate

: 75-04-7
ethylamine

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
at 100℃;

: 14467-74-4
S-phenyl N-ethylthiocarbamate

: 75-04-7
ethylamine

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With ethanol

: 75-04-7
ethylamine

: 109-90-0
ethyl isocyanate

: 623-76-7
N,N'-diethylurea

: 557-66-4
ethanamine hydrochloride

: 57-13-6
urea

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
at 160 - 170℃;
at 150 - 170℃;

: 693-29-8
N,N'-diethylcarbodiimide

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With hydrogenchloride

: 22390-04-1
1,3-diethyluracil

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With tetramethyl ammoniumhydroxide In dimethyl sulfoxide

: 627-45-2
N-formylethylamine

: 75-04-7
ethylamine

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
(i) IF5, Py, (ii) /BRN= 505933/, benzene; Multistep reaction;

: 201230-82-2
carbon monoxide

: 75-04-7
ethylamine

: 623-76-7
N,N'-diethylurea

Conditions

Conditions	Yield
With sulfur at 120℃;
With iodine; potassium carbonate; palladium diacetate In acetonitrile at 95℃; under 2052 Torr; for 3h;	75 % Chromat.

: 5710-11-2
N-ethyl-N'-hydroxyurea

A: 623-76-7
N,N'-diethylurea

B: 27108-44-7
N-ethyl-N'-ethylaminocarbonyloxyurea

C: 75-04-7
ethylamine

Conditions

Conditions	Yield
In acetonitrile Product distribution; Mechanism; Electrolysis of N-hydroxy- or N-alkoxy-ureas; the effect of divided or undivided cell and the excess of ethylamine or isopropylamine.;

...Expand

: 623-76-7
N,N'-diethylurea

: 205108-18-5
(E)-1-(buta-1,3-dien-1-yl)-4-(trifluoromethyl)benzene

: 1,3-Diethyl-4-[(E)-2-(4-trifluoromethyl-phenyl)-vinyl]-imidazolidin-2-one

Conditions

Conditions	Yield
With dichloro bis(acetonitrile) palladium(II); p-benzoquinone In 1,2-dimethoxyethane at 60℃; for 48h;	100%

: 623-76-7
N,N'-diethylurea

: 16939-57-4
(E)-1-Phenyl-1,3-butadiene

: 1,3-Diethyl-4-((E)-styryl)-imidazolidin-2-one

Conditions

Conditions	Yield
With dichloro bis(acetonitrile) palladium(II); p-benzoquinone In 1,2-dimethoxyethane at 60℃; for 24h;	99%

: 623-76-7
N,N'-diethylurea

: 141-82-2
malonic acid

: 32479-73-5
1,3-diethylbarbituric acid

Conditions

Conditions	Yield
With acetic anhydride; acetic acid at 60℃; for 6h;	97%
Stage #1: N,N'-diethylurea; malonic acid With acetic anhydride; acetic acid at 60℃; for 6h; Stage #2: In water at 70℃; for 0.5h;	65%

: 623-76-7
N,N'-diethylurea

: methyl 2-methylaminocyanoacetate

: 1,3-diethyl-5-methylamino-6-aminouracil

Conditions

Conditions	Yield
In 1,4-dioxane at 100 - 105℃; for 4h; Temperature;	95.8%

: 13987-61-6
N-methylene-tert-butylamine

: 623-76-7
N,N'-diethylurea

: 140367-28-8
5-tert-Butyl-1,3-diethyl-[1,3,5]triazinan-2-one

Conditions

Conditions	Yield
for 4h; Heating;	94%

: 623-76-7
N,N'-diethylurea

: 372-09-8
cyanoacetic acid

: 41740-15-2
6-amino-1,3-diethyluracil

Conditions

Conditions	Yield
Stage #1: N,N'-diethylurea; cyanoacetic acid In acetic anhydride at 75 - 85℃; for 2h; Inert atmosphere; Large scale; Stage #2: With sodium hydroxide at 5 - 10℃; for 1h; Large scale;	93.3%
With acetic anhydride at 80℃; for 2h;	88%
Stage #1: N,N'-diethylurea; cyanoacetic acid With acetic anhydride at 60℃; for 0.166667h; microwave irradiation; Stage #2: With sodium hydroxide In ethanol at 20℃;	70%

: 61066-33-9, 61066-34-0, 61066-35-1, 61127-23-9
pyrimidine-2,4,5,6(1H,3H)-tetraone

: 623-76-7
N,N'-diethylurea

: 71886-26-5
1,3-diethyl-4-hydroxy-2,5-dioxo-imidazolidine-4-carboxylic acid carbamoylamide

Conditions

Conditions	Yield
In water at 90℃;	93%
With water

: 623-76-7
N,N'-diethylurea

: (4SR,5RS,6SR)-5-methyl-4-phenyl-6-(pyrrolidin-1-ylcarbonyl)cycloheptane-1,2-dione

: C24H31N3O2

Conditions

Conditions	Yield
With zinc trifluoromethanesulfonate In acetonitrile at 100℃; for 2h; Inert atmosphere; Molecular sieve; Sealed vial;	93%

: 623-76-7
N,N'-diethylurea

: 39856-08-1, 141236-46-6
(E)-3,4-dimethoxycinnamic chloride

: ethyl 2-methylaminocyanoacetate

: 155270-99-8
istradefylline

Conditions

Conditions	Yield
Stage #1: N,N'-diethylurea; ethyl 2-methylaminocyanoacetate In 1,4-dioxane at 95 - 100℃; for 5h; Stage #2: With potassium hydroxide at 10 - 95℃; for 3h; Stage #3: (E)-3,4-dimethoxycinnamic chloride With triethylamine In 1,4-dioxane at 10 - 45℃; for 5h; Temperature;	90.9%

...Expand

: 131543-46-9
Glyoxal

: 623-76-7
N,N'-diethylurea

: 53629-29-1
1,3-diethyl-4,5-dihydroxyimidazolidin-2-one

Conditions

Conditions	Yield
With hydrogenchloride In water at 50℃; for 2h; pH=4 - 4.5;	90%
With sodium hydroxide at 50℃; for 7h; pH 5;	60%

: 623-76-7
N,N'-diethylurea

: 201230-82-2
carbon monoxide

: 2043-61-0
cyclohexanecarbaldehyde

: 5-cyclohexyl-1,3-diethyl-imidazolidine-2,4-dione

Conditions

Conditions	Yield
With sulfuric acid; lithium bromide; bis(triphenylphosphine)palladium dibromide In 1-methyl-pyrrolidin-2-one at 100℃; under 45003.6 Torr; for 12h; Cyclization;	89%

...Expand

: 79-37-8
oxalyl dichloride

: 623-76-7
N,N'-diethylurea

: 57012-86-9
1-ethyl-2,4,5-trioxoimidazolidine

Conditions

Conditions	Yield
With benzene at 20℃;	85%

: 623-76-7
N,N'-diethylurea

: 513-81-5
2,3-dimethyl-buta-1,3-diene

: 1,3-diethyl-4-isopropenyl-4-methyl-imidazolidin-2-one

Conditions

Conditions	Yield
With dichloro bis(acetonitrile) palladium(II); p-benzoquinone In 1,2-dimethoxyethane at 60℃; for 24h;	82%

: 85-44-9
phthalic anhydride

: 443-69-6
5-fluoro-1H-indole-2,3-dione

: 623-76-7
N,N'-diethylurea

: 5-hydroxy-5-(5-fluoro-2-(isoindolin-2-yl-1,3-dione)phenyl)-1,3-diethylhydantoin

Conditions

Conditions	Yield
With toluene-4-sulfonic acid In acetonitrile at 80℃; for 5h;	82%

...Expand

: 623-76-7
N,N'-diethylurea

: 78-79-5
isoprene

A: 1,3-diethyl-4-isopropenyl-imidazolidin-2-one

B: 1,3-diethyl-4-methyl-4-vinyl-imidazolidin-2-one

Conditions

Conditions	Yield
With dichloro bis(acetonitrile) palladium(II); p-benzoquinone In 1,2-dimethoxyethane at 60℃; for 24h; Title compound not separated from byproducts;	A 81% B n/a

...Expand

: 17933-16-3
dibromomethylborane

: 623-76-7
N,N'-diethylurea

A: 81233-27-4
3,5-Diethyl-2,3,5,6-tetrahydro-2,6-dimethyl-4H-1,3,5,2,6-oxadiazadiborin-4-on

B: 2-Methyl-1,3,5-triethyl-1,3,5-triaza-2-bora-cyclohexandion-4,6

Conditions

Conditions	Yield
In tetrachloromethane byproducts: HBr; edducts refluxed under N2 in 1:1 ratio for 24 h; evapd. in vac., distd. in vac., elem. anal.;	A n/a B 81%

...Expand

: 108-30-5
succinic acid anhydride

: 443-69-6
5-fluoro-1H-indole-2,3-dione

: 623-76-7
N,N'-diethylurea

: 5-hydroxy-5-(5-fluoro-2-(pyrrolidin-1-yl-2,5-dione)phenyl)-1,3-diethylhydantoin

Conditions

Conditions	Yield
With toluene-4-sulfonic acid In acetonitrile at 80℃; for 5h;	81%

...Expand

: 85-44-9
phthalic anhydride

: 623-76-7
N,N'-diethylurea

: 17630-76-1
5-chloroindole 2,3-dione

: 5-hydroxy-5-(5-chloro-2-(isoindolin-2-yl-1,3-dione)phenyl)-1,3-diethylhydantoin

Conditions

Conditions	Yield
With toluene-4-sulfonic acid In acetonitrile at 80℃; for 5h;	81%

...Expand

: 623-76-7
N,N'-diethylurea

: 19091-98-6
ethylnitramine

Conditions

Conditions	Yield
With fuming sulphuric acid; nitric acid In dichloromethane at -5 - 20℃; for 1h; Temperature;	80.6%

: 50-00-0
formaldehyd

: 623-76-7
N,N'-diethylurea

: 3081-24-1
H-Phe-OEt

: 130750-10-6
(S)-2-(3,5-Diethyl-4-oxo-[1,3,5]triazinan-1-yl)-3-phenyl-propionic acid ethyl ester

Conditions

Conditions	Yield
In water at 70 - 110℃;	80%

...Expand

: 50-00-0
formaldehyd

: 623-76-7
N,N'-diethylurea

: 26348-61-8
L-serine ethyl ester hydrochloride

: 130767-32-7
5-<1-(S)-(1-Carbethoxy-2-hydroxy)ethyl>-1,3-diethyl-hexahydro-2-oxo-1,3,5-triazine

Conditions

Conditions	Yield
With triethylamine In ethanol; water for 20h; Heating;	80%

...Expand

: 623-76-7
N,N'-diethylurea

: 32507-39-4
(E)-1-(buta-1,3-diene-1-yl)-4-methoxybenzene

: 1,3-Diethyl-4-[(E)-2-(4-methoxy-phenyl)-vinyl]-imidazolidin-2-one

Conditions

Conditions	Yield
With dichloro bis(acetonitrile) palladium(II); p-benzoquinone In 1,2-dimethoxyethane at 60℃; for 24h;	80%

: 85-44-9
phthalic anhydride

: 608-05-9
5-methyl-indole-2,3-dione

: 623-76-7
N,N'-diethylurea

: 5-hydroxy-5-(5-methyl-2-(isoindolin-2-yl-1,3-dione)phenyl)-1,3-diethylhydantoin

Conditions

Conditions	Yield
With toluene-4-sulfonic acid In acetonitrile at 80℃; for 5h;	80%

...Expand

: 17933-16-3
dibromomethylborane

: 623-76-7
N,N'-diethylurea

A: 122-56-5
tributyl borane

B: 81233-27-4
3,5-Diethyl-2,3,5,6-tetrahydro-2,6-dimethyl-4H-1,3,5,2,6-oxadiazadiborin-4-on

Conditions

Conditions	Yield
With n-butyllithium In hexane; Petroleum ether byproducts: butane, LiBr; the urea in petroleum ether was refluxed under N2 with n-BuLi in hexanefor 48 h; the solvents were removed in vac., the residue was fractional distd.; elem. anal.;	A n/a B 79%

...Expand

1,3-Diethylurea Specification

The Urea, N, N'-diethyl-, with the CAS registry number of 623-76-7, is also known as 1, 3-Diethyl-ure. It belongs to the product categories of Carbonyl Compounds; Organic Building Blocks; Ureas. Its EINECS registry number is 210-811-3. This chemical's molecular formula is C₅H₁₂N₂O and molecular weight is 116.16. What's more, its IUPAC name is 1, 3-Diethylurea. This chemical's classification code is Mutation data. In addition, it must be stored in airtight containers and placed in a dry, cool place. Meanwhile, it should avoid contact with oxidant, alkali, ignition source.

Physical properties about Urea, N, N'-diethyl- are: (1)ACD/LogP: 0.05; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 0.05; (4)ACD/LogD (pH 7.4): 0.05; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 25.28; (8)ACD/KOC (pH 7.4): 25.28; (9)#H bond acceptors: 3; (10)#H bond donors: 2; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 23.55 Å²; (13)Index of Refraction: 1.428; (14)Molar Refractivity: 32.43 cm³; (15)Molar Volume: 125.8 cm³; (16)Polarizability: 12.85×10^-24 cm³; (17)Surface Tension: 29 dyne/cm; (18)Density: 0.923 g/cm³; (19)Flash Point: 121.1 °C; (20)Enthalpy of Vaporization: 50.08 kJ/mol; (21)Boiling Point: 263 °C at 760 mmHg; (22)Vapour Pressure: 0.0106 mmHg at 25 °C; (23)Melting Point: 112-113 °C(lit. ).

Preparation: this chemical is prepared by Isocyanatoethane. The reaction needs reagent H₂ and solvent Tetrahydrofuran. The reaction time is 40 hours with reaction temperature of 120 °C. The yield is about 41 %.

Uses: it is used to produce other chemicals. For example, it is used to produce 1, 3-Diethyl-4-hydroxy-2, 5-dioxo-imidazolidine-4-carboxylic acid carbamoylamide. This reaction needs solvent H₂O. The reaction temperature is 90 °C. The yield is about 93 %.

When you are using this chemical, please be cautious about it as the following:
As a chemical, it is irritating to eyes, respiratory system and skin. The dust of this chemical can not be breathed. And you should avoid contacting with skin and eyes. In addition, this chemical is toxic by inhalation, in contact with skin and if swallowed. During using it, wear suitable protective clothing, gloves and eye/face protection. Besides, this chemical is highly flammable, it may catch fire in contact with an ignition source. What's more, it must be stored in airtight containers and placed in a cool, well-ventilated place.

You can still convert the following datas into molecular structure:
(1) SMILES: O=C(NCC)NCC
(2) InChI: InChI=1/C5H12N2O/c1-3-6-5(8)7-4-2/h3-4H2,1-2H3,(H2,6,7,8)
(3) InChIKey: ZWAVGZYKJNOTPX-UHFFFAOYAT

The toxicity data is as follows:

Organism	Test Type	Route	Reported Dose (Normalized Dose)	Effect	Source
mouse	LDLo	intraperitoneal	3195mg/kg (3195mg/kg)	BEHAVIORAL: GENERAL ANESTHETIC BEHAVIORAL: SOMNOLENCE (GENERAL DEPRESSED ACTIVITY)	Journal of Pharmacology and Experimental Therapeutics. Vol. 54, Pg. 188, 1935.

Product Name

1,3-Diethylurea

Synthetic route

1,3-Diethylurea Specification

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