1H-3-Benzazepine,2,3,4,5-tetrahydro- supplier

Name
2,3,4,5-TETRAHYDRO-1H-BENZO[D]AZEPINE
EINECS 807-686-8
CAS No. 4424-20-8
Article Data18
CAS DataBase
Density 0.981 g/cm³
Solubility
Melting Point
Formula C₁₀H₁₃N
Boiling Point 258.8 °C at 760 mmHg
Molecular Weight 147.22
Flash Point 114.9 °C
Transport Information
Appearance
Safety 23-26-36/37/39-45
Risk Codes 20/21/22-34
Molecular Structure
Hazard Symbols Xi
Synonyms 2,3,4,5-Tetrahydro-1H-3-benzazepine;2,3,4,5-Tetrahydro-1H-benzo[d]azepine;5-Azabenzocycloheptene;
PSA 12.03000
LogP 1.70360

Synthetic route

: 130800-04-3
1,2-phenylenebis(ethane-2,1-diyl) dimethanesulfonate

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
With ammonia at 90℃; for 3h; Sealed tube;	100%
Stage #1: 1,2-phenylenebis(ethane-2,1-diyl) dimethanesulfonate With ammonia In water; acetonitrile at 100℃; under 2068.65 Torr; for 1h; Stage #2: With hydrogenchloride; water In acetonitrile pH=4; Stage #3: With sodium hydroxide In diethyl ether; water; acetonitrile pH=14;	81%
With ammonia In ethanol; water at 80℃; for 0.666667h; Microwave;	73%
With ammonia In acetonitrile at 100℃; under 2068.65 Torr; for 1h; Autoclave;	20%

: 3-benzyl-2,3,4,5-tetrahydro-1H-benzo[d]azepine

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
With hydrogenchloride; palladium 10% on activated carbon In ethanol; water at 20℃; for 48h;	95%

: 215033-43-5
3-formyl-2,3,4,5-tetrahydro-1H-3-benzazepine

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
With sodium hydroxide In ethanol for 1h; Hydrolysis; Heating;	77%

: 613-73-0
1,2-phenylenediacetonitrile

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
With ammonia; hydrogen; nickel In ethanol at 50℃; under 51714.8 Torr; for 24h;	60%
With ammonia; hydrogen; Raney Nickel In methanol at 70℃; under 36201.3 Torr; for 48h;	47%
In ethanol; dichloromethane	35%

: 613-73-0
1,2-phenylenediacetonitrile

A: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

B: 42988-81-8
2,2'-o-phenylene-bis-ethylamine

Conditions

Conditions	Yield
With ethanol; ammonia; nickel under 51485.6 Torr; Hydrogenation;

lactam of/the/ 2-<β-amino-ethyl>-phenylacetic acid: lactam of/the/ 2-<β-amino-ethyl>-phenylacetic acid

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
With ethanol; sodium

: 64-17-5
ethanol

: 7664-41-7
ammonia

: 613-73-0
1,2-phenylenediacetonitrile

nickel: nickel

A: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

B: 42988-81-8
2,2'-o-phenylene-bis-ethylamine

Conditions

Conditions	Yield
unter Druck.Hydrogenation;

...Expand

: 64-04-0
phenethylamine

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
Multi-step reaction with 6 steps 1: 63 percent / Na2CO3; NaI; tetrabutylammonium bromide / dioxane / Heating 2: 99 percent / acetic anhydride / 1 h / 60 °C 3: 92 percent / aq. NaIO4 / methanol / 1.5 h / 20 °C 4: 47 percent / TFAA; BF3Et2O / benzene / 2 h / 20 °C 5: 77 percent / NiCl26H2O; NaBH4 / methanol; tetrahydrofuran / 0.33 h / 20 °C 6: 77 percent / aq. NaOH / ethanol / 1 h / Heating View Scheme

Yield

Multi-step reaction with 6 steps
1: 63 percent / Na2CO3; NaI; tetrabutylammonium bromide / dioxane / Heating
2: 99 percent / acetic anhydride / 1 h / 60 °C
3: 92 percent / aq. NaIO4 / methanol / 1.5 h / 20 °C
4: 47 percent / TFAA; BF3*Et2O / benzene / 2 h / 20 °C
5: 77 percent / NiCl2*6H2O; NaBH4 / methanol; tetrahydrofuran / 0.33 h / 20 °C
6: 77 percent / aq. NaOH / ethanol / 1 h / Heating
View Scheme

: 304011-19-6
N-(2-phenylethyl)-2-phenylsulfanylethylamine

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
Multi-step reaction with 5 steps 1: 99 percent / acetic anhydride / 1 h / 60 °C 2: 92 percent / aq. NaIO4 / methanol / 1.5 h / 20 °C 3: 47 percent / TFAA; BF3Et2O / benzene / 2 h / 20 °C 4: 77 percent / NiCl26H2O; NaBH4 / methanol; tetrahydrofuran / 0.33 h / 20 °C 5: 77 percent / aq. NaOH / ethanol / 1 h / Heating View Scheme

: 304011-24-3
N-(2-phenylethyl)-N-(2-phenylsulfanylethyl)formamide

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
Multi-step reaction with 4 steps 1: 92 percent / aq. NaIO4 / methanol / 1.5 h / 20 °C 2: 47 percent / TFAA; BF3Et2O / benzene / 2 h / 20 °C 3: 77 percent / NiCl26H2O; NaBH4 / methanol; tetrahydrofuran / 0.33 h / 20 °C 4: 77 percent / aq. NaOH / ethanol / 1 h / Heating View Scheme

: 304011-32-3
3-formyl-1-phenylsulfanyl-2,3,4,5-tetrahydro-1H-3-benzazepine

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 77 percent / NiCl2*6H2O; NaBH4 / methanol; tetrahydrofuran / 0.33 h / 20 °C 2: 77 percent / aq. NaOH / ethanol / 1 h / Heating View Scheme

: 304011-27-6
N-(2-phenylethyl)-N-(2-phenylsulfinylethyl)formamide

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
Multi-step reaction with 3 steps 1: 47 percent / TFAA; BF3Et2O / benzene / 2 h / 20 °C 2: 77 percent / NiCl26H2O; NaBH4 / methanol; tetrahydrofuran / 0.33 h / 20 °C 3: 77 percent / aq. NaOH / ethanol / 1 h / Heating View Scheme

: 15987-50-5
1,3,4,5-tetrahydro-2H-benzo[d]azepin-2-one

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
With borane-THF

: 7500-53-0
1,2-Phenylenediacetic acid

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
Multi-step reaction with 3 steps 1: lithium aluminium tetrahydride / tetrahydrofuran / 0 - 20 °C 2: triethylamine / dichloromethane / 0.5 h / 0 °C 3: ammonia / acetonitrile / 1 h / 100 °C / 2068.65 Torr / Autoclave View Scheme
Multi-step reaction with 3 steps 1: lithium aluminium tetrahydride / tetrahydrofuran / 16 h / Reflux 2: triethylamine / dichloromethane / 0.5 h / 20 °C 3: ammonia / 3 h / 90 °C / Sealed tube View Scheme

: 17378-99-3
2,2’-(1,2-phenylene)diethanol

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: triethylamine / dichloromethane / 0.5 h / 0 °C 2: ammonia / acetonitrile / 1 h / 100 °C / 2068.65 Torr / Autoclave View Scheme
Multi-step reaction with 2 steps 1: triethylamine / dichloromethane / 0.5 h / 20 °C 2: ammonia / 3 h / 90 °C / Sealed tube View Scheme

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 407-25-0
trifluoroacetic anhydride

: 158726-30-8
3-trifluoroacetyl-2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
With triethylamine In dichloromethane at 0℃; for 1h;	100%
In dichloromethane at -20 - 20℃; for 12h;	98%
With pyridine In dichloromethane at 0 - 20℃; Inert atmosphere;	97%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 2131-55-7
4-Chlorophenyl isothiocyanate

: 915104-43-7
N-(4-Chlorophenyl)-1 ,2,4,5-tetrahydro-3H-3-benzazepine-3-carbothioamide

Conditions

Conditions	Yield
In dichloromethane at 20℃; for 1h;	100%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 10533-22-9
1-(1,2,4,5-tetrahydro-benzo[d]azepin-3-yl)-ethanone

Conditions

Conditions	Yield
With acetic anhydride; triethylamine In dichloromethane; water	95%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 108-24-7
acetic anhydride

: 10533-22-9
1-(1,2,4,5-tetrahydro-benzo[d]azepin-3-yl)-ethanone

Conditions

Conditions	Yield
With triethylamine In dichloromethane at 0 - 20℃; for 18h;	95%
With triethylamine In dichloromethane	50%
With triethylamine In dichloromethane at 20℃; for 18h;

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
With sulfuric acid; nitric acid; trifluoroacetic acid at 0℃; regioselective reaction;	90%
With sulfuric acid; nitric acid; trifluoroacetic acid at 0℃; for 2h;	63%
Stage #1: 2,3,4,5-tetrahydro-1H-3-benzazepine With sulfuric acid at 0℃; for 0.5h; Stage #2: With nitric acid In water at 0℃; for 2h;	25%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 1241840-94-7
7-nitro-2,3,4,5-tetrahydro-1H-benzo[d]azepine monosulfate

Conditions

Conditions	Yield
Stage #1: 2,3,4,5-tetrahydro-1H-3-benzazepine With trifluoroacetic acid for 0.5h; Inert atmosphere; Stage #2: With sulfuric acid for 0.25h; Stage #3: With nitric acid at 5 - 10℃; for 4h; regioselective reaction;	90%
With sulfuric acid; nitric acid; trifluoroacetic acid at 0 - 10℃;	86%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: ethyl N-[4-chloro-6-(2H-indazol-2-yl)pyrimidin-2-yl]-beta-alaninate

: C26H28N6O2

Conditions

Conditions	Yield
With N-ethyl-N,N-diisopropylamine In isopropyl alcohol at 160℃; for 1h; Microwave irradiation;	89%
In isopropyl alcohol for 2h;	83%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 1373424-45-3
N-[6-chloro-2-(2-pyridinyl)-4-pyrimidinyl]-β-alanine

: 1373422-53-7
(3-((2-pyridin-2-yl)-6-(1,2,4,5-tetrahydro-3H-benzo[d]azepin-3-yl)pyrimidin-4-yl)amino)propanoic acid

Conditions

Conditions	Yield
With N-ethyl-N,N-diisopropylamine In dimethyl sulfoxide at 150℃; for 1h; Microwave irradiation;	86%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: ethyl N-[4-chloro-6-(2H-1,2,3-triazol-2-yl)pyrimidin-2-yl]-beta-alaninate

: ethyl N-[4-(1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-6-(2H-1,2,3-triazol-2-yl)pyrimidin-2-yl]-beta-alaninate

Conditions

Conditions	Yield
With N-ethyl-N,N-diisopropylamine In isopropyl alcohol at 160℃; for 1h; Microwave irradiation;	85%
In isopropyl alcohol for 2h;	35%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: ethyl N-[4-chloro-6-(1H-1,2,3-triazol-1-yl)pyrimidin-2-yl]-beta-alaninate

: ethyl N-[4-(1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-6-(1H-1,2,3-triazol-1-yl)pyrimidin-2-yl]-beta-alaninate

Conditions

Conditions	Yield
With N-ethyl-N,N-diisopropylamine In isopropyl alcohol at 160℃; for 1h; Microwave irradiation;	85%
In isopropyl alcohol for 2h;	75%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: ethyl N-[4-chloro-6-(1H-pyrazol-1-yl)pyrimidin-2-yl]-beta-alaninate

: ethyl N-[4-(1H-pyrazol-1-yl)-6-(1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)pyrimidin-2-yl]-beta-alaninate

Conditions

Conditions	Yield
In isopropyl alcohol for 2h;	84%
With N-ethyl-N,N-diisopropylamine In isopropyl alcohol at 160℃; for 1h; Microwave irradiation;	84%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 1793-07-3
methyl 2-isocyanatobenzoate

: methyl 2-(2,3,4,5-tetrahydro-1H-benzo[d]azepine-3-carboxamido)benzoate

Conditions

Conditions	Yield
With triethylamine In dichloromethane at 25℃; for 2h; Inert atmosphere;	83%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 14625-39-9
2-(chloromethyl)-5-nitro-1H-benzo[d]imidazole

: 3-((5-nitro-1H-benzo[d]imidazol-2-yl)methyl)-2,3,4,5-tetrahydro-1H-benzo[d]azepine

Conditions

Conditions	Yield
With sodium carbonate In acetonitrile at 23℃;	82%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 75-36-5
acetyl chloride

: 10533-22-9
1-(1,2,4,5-tetrahydro-benzo[d]azepin-3-yl)-ethanone

Conditions

Conditions	Yield
With triethylamine In tetrahydrofuran at 20℃; for 1h;	80%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: ethyl N-[4-chloro-6-(1,3-thiazol-2-yl)pyrimidin-2-yl]-beta-alaninate

: ethyl N-[4-(1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-6-(1,3-thiazol-2-yl)pyrimidin-2-yl]-beta-alaninate

Conditions

Conditions	Yield
In isopropyl alcohol for 2h;	80%
With N-ethyl-N,N-diisopropylamine In isopropyl alcohol at 160℃; for 1h; Microwave irradiation;	80%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: C12H10ClN5

: C22H22N6

Conditions

Conditions	Yield
With N-ethyl-N,N-diisopropylamine In isopropyl alcohol at 160℃; for 1h; Microwave irradiation;	80%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: C9H11N3O2

Conditions

Conditions	Yield
With sulfuric acid; potassium nitrate at 5℃; for 0.166667h;	71%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 2417-72-3
Methyl 4-(bromomethyl)benzoate

: methyl 4-((1,2,4,5-tetrahydro-3H-benzo[d]azepin-3-yl)methyl)benzoate

Conditions

Conditions	Yield
With potassium carbonate In acetonitrile at 85℃; for 4h;	71%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 118454-13-0
7-nitro-2,3,4,5-tetrahydro-1H-benzo[d]azepine nitrate salt

Conditions

Conditions	Yield
With nitric acid at -10℃; for 0.5h; Cooling with acetone-dry ice;	70%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 82771-52-6
C20H25N3O4S2

Conditions

Conditions	Yield
With bis(chlorosulfonyl)amine; triethylamine In dichloromethane; acetonitrile at 25℃; for 12h;	67%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 100-52-7
benzaldehyde

: 135-19-3
β-naphthol

: 1-[(4,5-dihydro-1H-benzo[d]azepin-3(2H)-yl)phenylmethyl]naphthalen-2-ol

Conditions

Conditions	Yield
In neat (no solvent) at 60℃; for 2h; Mannich Aminomethylation; Autoclave; Microwave irradiation;	67%

...Expand

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 215790-29-7
1,1-dimethylethyl[trans-4-(2-oxoethyl)cyclohexyl]carbamate

: trans-3-(2-(1-(4-(N-tert-butoxycarbonyl)amino)cyclohexyl)ethyl)-2,3,4,5-tetrahydro-1H-3-benzazepine

Conditions

Conditions	Yield
Stage #1: 2,3,4,5-tetrahydro-1H-3-benzazepine; 1,1-dimethylethyl[trans-4-(2-oxoethyl)cyclohexyl]carbamate With sodium tris(acetoxy)borohydride In 1,2-dichloro-ethane at 20℃; for 0.5h; Stage #2: With water; potassium carbonate In dichloromethane; 1,2-dichloro-ethane	62%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 1373424-24-8
ethyl N-(2-{4-[2-(1,3-dioxolan-2-yl)ethyl]-2-pyridinyl}-6-{[(4-methylphenyl)sulfonyl]oxy}-4-pyrimidinyl)-β-alaninate

: 1373424-25-9
ethyl N-[2-{4-[2-(1,3-dioxolan-2-yl)ethyl]-2-pyridinyl}-6-(1,2,4,5-tetrahydro-3H-3-benzazepin-3-yl)-4-pyrimidinyl]-β-alaninate

Conditions

Conditions	Yield
In isopropyl alcohol at 150℃; for 1h; Microwave irradiation;	60%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 40877-09-6
4-chloro-1-(4-chlorophenyl)butan-1-one

: 1-(4-chlorophenyl)-4-(4,5-dihydro-1H-benzo[d]azepin-3(2H)-yl)butan-1-one hydrochloride

Conditions

Conditions	Yield
Stage #1: 2,3,4,5-tetrahydro-1H-3-benzazepine; 4-chloro-1-(4-chlorophenyl)butan-1-one With potassium carbonate; potassium iodide In 1,2-dimethoxyethane at 120℃; for 1h; Sealed tube; Microwave irradiation; Stage #2: With hydrogenchloride In diethyl ether Solvent;	59%

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 90-15-3
α-naphthol

: 100-52-7
benzaldehyde

: 2-[(4,5-dihydro-1H-benzo[d]azepin-3(2H)-yl)-phenyl-methyl]-naphthalen-1-ol

Conditions

Conditions	Yield
In neat (no solvent) at 55℃; for 1.5h; Mannich Aminomethylation; Autoclave; Microwave irradiation;	55%

...Expand

: 4424-20-8
2,3,4,5-tetrahydro-1H-3-benzazepine

: 2-(3-{5-chloro-2-[(oxan-4-yl)amino]pyrimidin-4-yl}-5-oxo-5H,6H,7H-pyrrolo[3,4-b]pyridin-6-yl)acetic acid

: 3-{5-chloro-2-[(oxan-4-yl)amino]pyrimidin-4-yl}-6-[2-oxo-2-(2,3,4,5-tetrahydro-1H-3-benzazepin-3-yl)ethyl]-5H,6H,7H-pyrrolo[3,4-b]pyridin-5-one

Conditions

Conditions	Yield
With 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; triethylamine In ethyl acetate; N,N-dimethyl-formamide for 1h;	51.9%

1H-3-Benzazepine,2,3,4,5-tetrahydro- Specification

The 1H-3-Benzazepine, 2, 3, 4, 5-tetrahydro-, with the CAS registry number of 4424-20-8, is also known as 2, 3, 4, 5-Tetrahydro-1H-benzo[d]azepine. This chemical's molecular formula is C₁₀H₁₃N and molecular weight is 147.22. What's more, its IUPAC name is 2, 3, 4, 5-Tetrahydro-1H-3-benzazepine.

Physical properties about 1H-3-Benzazepine, 2, 3, 4, 5-tetrahydro- are: (1)ACD/LogP: 1.81; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -1.29; (4)ACD/LogD (pH 7.4): -0.87; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 1; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 1; (10)#H bond donors: 1; (11)#Freely Rotating Bonds: 0; (12)Polar Surface Area: 3.24 Å²; (13)Index of Refraction: 1.53; (14)Molar Refractivity: 46.38 cm³; (15)Molar Volume: 150 cm³; (16)Surface Tension: 35.5 dyne/cm; (17)Density: 0.981 g/cm³; (18)Flash Point: 114.9 °C; (19)Enthalpy of Vaporization: 49.64 kJ/mol; (20)Boiling Point: 258.8 °C at 760 mmHg; (21)Vapour Pressure: 0.0135 mmHg at 25 °C.

Preparation: this chemical is prepared by 3, 4-Dihydro-2H-naphthalen-1-one oxime. The reaction needs reagent Diisobutyl aluminium hydride and solvent CH₂Cl₂. The reaction time is 1 hours with reaction temperature of 0 °C. The yield is about 92 %.

Uses: it is used to produce other chemicals. For example, it is used to produce 1-Methyl-2, 3, 4, 5-tetrahydro-1H-benzo[b]azepine. This reaction needs reagent n-Butyllithium. Meanwhile, it needs solvents Tetrahydrofuran and Hexane. Other conditions of this reaction are 1.)THF, Hexane, 0 °C; 2.)12 h, r.t..The yield is about 60 %.

You can still convert the following datas into molecular structure:
(1) SMILES: c1cc2c(cc1)CCNCC2
(2) InChI: InChI=1/C10H13N/c1-2-4-10-6-8-11-7-5-9(10)3-1/h1-4,11H,5-8H2
(3) InChIKey: MWVMYAWMFTVYED-UHFFFAOYAW

Product Name

2,3,4,5-TETRAHYDRO-1H-BENZO[D]AZEPINE

Synthetic route

1H-3-Benzazepine,2,3,4,5-tetrahydro- Specification

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