2-(2-Amino-5-bromobenzoyl)pyridine supplier

Name
2-(2-AMINO-5-BROMOBENZOYL) PYRIDINE
EINECS 216-352-5
CAS No. 1563-56-0
Article Data22
CAS DataBase
Density 1.546 g/cm³
Solubility
Melting Point 98-100oC
Formula C₁₂H₉BrN₂O
Boiling Point 451.2 °C at 760 mmHg
Molecular Weight 277.12
Flash Point 226.7 °C
Transport Information
Appearance Yellow solid
Safety
Risk Codes
Molecular Structure
Hazard Symbols
Synonyms Ketone,2-amino-5-bromophenyl 2-pyridyl (7CI,8CI);2-(5-Bromo-2-aminobenzoyl)pyridine;2-Amino-5-bromophenyl 2-pyridyl ketone;2-Amino-5-bromophenyl-2-pyridylmethanone;
PSA 55.98000
LogP 3.23850

Synthetic route

: 162271-31-0
2-(5-bromo-2-hydroxybenzoyl)pyridine

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
Stage #1: 2-(5-bromo-2-hydroxybenzoyl)pyridine With 2-bromo-2-methylpropanamide; sodium hydroxide In N,N-dimethyl acetamide at 20 - 50℃; for 4h; Stage #2: With water for 4h; Reflux;	95.6%

: 109-04-6
2-bromo-pyridine

: 5794-88-7
5-Bromo-2-aminobenzoic acid

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
Stage #1: 2-bromo-pyridine; n-butyllithium In diethyl ether; hexane at -40℃; for 1.5h; Stage #2: 5-Bromo-2-aminobenzoic acid In tetrahydrofuran; diethyl ether; hexane at 0℃; for 2h; Stage #3: With hydrogenchloride; sodium hydroxide; chloro-trimethyl-silane more than 3 stages;	89.3%
Stage #1: 2-bromo-pyridine With n-butyllithium In tetrahydrofuran at -40℃; Stage #2: 5-Bromo-2-aminobenzoic acid In tetrahydrofuran at -40 - 0℃; for 2h; Stage #3: With chloro-trimethyl-silane In tetrahydrofuran at 20℃; for 0.5h;	62.7%
Stage #1: 2-bromo-pyridine With n-butyllithium In tetrahydrofuran at -40℃; for 1.25h; Stage #2: 5-Bromo-2-aminobenzoic acid In tetrahydrofuran at 0℃; for 2h;	62.7%
Stage #1: 2-bromo-pyridine With n-butyllithium In tetrahydrofuran at -40℃; for 1h; Inert atmosphere; Stage #2: 5-Bromo-2-aminobenzoic acid In tetrahydrofuran at 0 - 10℃; for 3h; Inert atmosphere;	50.7%

: 5794-88-7
5-Bromo-2-aminobenzoic acid

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
Stage #1: 2-bromo-pyridine With n-butyllithium In tetrahydrofuran at -40℃; Stage #2: 5-Bromo-2-aminobenzoic acid In tetrahydrofuran at 0℃;	58%

: 1812-30-2
bromazepam

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
With intestinal microflora (human) In N,N-dimethyl-formamide at 37℃; for 5h;
With acid
With hydrogenchloride In methanol; water for 3h; Reagent/catalyst; Darkness; Reflux;

: 1812-30-2
bromazepam

A: 1563-56-0
2-amino-5-bromobenzoyl pyridine

B: 56-40-6
glycine

Conditions

Conditions	Yield
With hydrogenchloride at 25℃; Rate constant; Mechanism; also in micellar system;

: C24H17Br2N5

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
With hydrogenchloride at 90℃; for 1h;

: 4‑bromo‑2‑(bromomethyl)‑1‑((2‑methoxyethoxy)methoxy)benzene

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
Multi-step reaction with 5 steps 1.1: magnesium; triethylamine / tetrahydrofuran / 20 °C 1.2: 20 h / pH 1 / Reflux 1.3: pH 1 2.1: (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; sodium carbonate / tetrahydrofuran; N,N-dimethyl-formamide / 6 h / 75 °C / Inert atmosphere 3.1: tert.-butylhydroperoxide; iodine; pyridine / water / 6 h / 80 °C 4.1: titanium tetrachloride / dichloromethane / 4 h / 20 °C 5.1: sodium hydroxide; 2-bromo-2-methylpropanamide / N,N-dimethyl acetamide / 4 h / 20 - 50 °C 5.2: 4 h / Reflux View Scheme

Yield

Multi-step reaction with 5 steps
1.1: magnesium; triethylamine / tetrahydrofuran / 20 °C
1.2: 20 h / pH 1 / Reflux
1.3: pH 1
2.1: (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; sodium carbonate / tetrahydrofuran; N,N-dimethyl-formamide / 6 h / 75 °C / Inert atmosphere
3.1: tert.-butylhydroperoxide; iodine; pyridine / water / 6 h / 80 °C
4.1: titanium tetrachloride / dichloromethane / 4 h / 20 °C
5.1: sodium hydroxide; 2-bromo-2-methylpropanamide / N,N-dimethyl acetamide / 4 h / 20 - 50 °C
5.2: 4 h / Reflux
View Scheme

: 5-bromo-2-(((2-methoxyethoxy)methoxy)benzyl)boronic acid

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
Multi-step reaction with 4 steps 1.1: (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; sodium carbonate / tetrahydrofuran; N,N-dimethyl-formamide / 6 h / 75 °C / Inert atmosphere 2.1: tert.-butylhydroperoxide; iodine; pyridine / water / 6 h / 80 °C 3.1: titanium tetrachloride / dichloromethane / 4 h / 20 °C 4.1: sodium hydroxide; 2-bromo-2-methylpropanamide / N,N-dimethyl acetamide / 4 h / 20 - 50 °C 4.2: 4 h / Reflux View Scheme

Yield

Multi-step reaction with 4 steps
1.1: (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; sodium carbonate / tetrahydrofuran; N,N-dimethyl-formamide / 6 h / 75 °C / Inert atmosphere
2.1: tert.-butylhydroperoxide; iodine; pyridine / water / 6 h / 80 °C
3.1: titanium tetrachloride / dichloromethane / 4 h / 20 °C
4.1: sodium hydroxide; 2-bromo-2-methylpropanamide / N,N-dimethyl acetamide / 4 h / 20 - 50 °C
4.2: 4 h / Reflux
View Scheme

: 2-(5-bromo-2-(((2-methoxyethoxy)methoxy)benzyl)pyridine)

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
Multi-step reaction with 3 steps 1.1: tert.-butylhydroperoxide; iodine; pyridine / water / 6 h / 80 °C 2.1: titanium tetrachloride / dichloromethane / 4 h / 20 °C 3.1: sodium hydroxide; 2-bromo-2-methylpropanamide / N,N-dimethyl acetamide / 4 h / 20 - 50 °C 3.2: 4 h / Reflux View Scheme

: 5532-69-4
4-bromo-2-(hydroxymethyl)phenol

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

Conditions

Conditions	Yield
Multi-step reaction with 6 steps 1.1: triethylamine / dichloromethane / 6 h / 25 °C 2.1: magnesium; triethylamine / tetrahydrofuran / 20 °C 2.2: 20 h / pH 1 / Reflux 2.3: pH 1 3.1: (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; sodium carbonate / tetrahydrofuran; N,N-dimethyl-formamide / 6 h / 75 °C / Inert atmosphere 4.1: tert.-butylhydroperoxide; iodine; pyridine / water / 6 h / 80 °C 5.1: titanium tetrachloride / dichloromethane / 4 h / 20 °C 6.1: sodium hydroxide; 2-bromo-2-methylpropanamide / N,N-dimethyl acetamide / 4 h / 20 - 50 °C 6.2: 4 h / Reflux View Scheme

Yield

Multi-step reaction with 6 steps
1.1: triethylamine / dichloromethane / 6 h / 25 °C
2.1: magnesium; triethylamine / tetrahydrofuran / 20 °C
2.2: 20 h / pH 1 / Reflux
2.3: pH 1
3.1: (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; sodium carbonate / tetrahydrofuran; N,N-dimethyl-formamide / 6 h / 75 °C / Inert atmosphere
4.1: tert.-butylhydroperoxide; iodine; pyridine / water / 6 h / 80 °C
5.1: titanium tetrachloride / dichloromethane / 4 h / 20 °C
6.1: sodium hydroxide; 2-bromo-2-methylpropanamide / N,N-dimethyl acetamide / 4 h / 20 - 50 °C
6.2: 4 h / Reflux
View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 598-21-0
2-Bromoacetyl bromide

: 1694-64-0
2-bromo-N-(4-bromo-2-(pyridin-2-ylcarbonyl)phenyl)acetamide

Conditions

Conditions	Yield
With sodium hydrogencarbonate In dichloromethane at 0℃; for 2h;	100%
With sodium hydrogencarbonate In dichloromethane at 0 - 20℃;
With sodium hydrogencarbonate In dichloromethane Inert atmosphere;

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 79-04-9
chloroacetyl chloride

: 41526-21-0
N-(4-bromo-2-picolinoylphenyl)-2-chloroacetamide

Conditions

Conditions	Yield
With sodium hydrogencarbonate In dichloromethane Inert atmosphere;	98.5%
With pyridine In dichloromethane at 20℃; for 0.5h;	94%

: 4652-65-7
(S)-2-Benzyloxycarbonylamino-pentanedioic acid 5-methyl ester

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: methyl (4S)-4-(benzyloxycarbonylamino)-5-[4-bromo-2-(pyridine-2-carbonyl)aniline]-5-oxopentanoate

Conditions

Conditions	Yield
With dicyclohexyl-carbodiimide In dichloromethane at -10 - 15℃; for 48h; Temperature;	93.6%
With dicyclohexyl-carbodiimide In dichloromethane at -10 - 15℃; for 48h;	93.6%

: (2S)-2-(fluorenyl-9-methoxycarbonylamino)-5-methoxy-5-oxopentanoic acid chloride

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: methyl (4S)-4-(fluorenyl-9-methoxycarbonylamino)-5-[4-bromo-2-(pyridin-2-carbonyl)anilino]-5-oxopentanoate

Conditions

Conditions	Yield
In dichloromethane at 0 - 10℃; for 0.5h; Reflux;	91.7%

: 15761-38-3
L-N-Boc-Ala

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

A: (S)-{1-[4-bromo-2-(pyridine-2-carbonyl)-phenylcarbamoyl]-ethyl}-carbamic acid tert-butyl ester

B: 2387-23-7
1,3-Dicyclohexylurea

Conditions

Conditions	Yield
With dicyclohexyl-carbodiimide In dichloromethane at 0 - 20℃; for 8.5h;	A 81% B n/a

...Expand

: 1161-13-3
N-Cbz-L-Phe

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 136295-73-3
2-(N-carbobenzoxy-S-phenylalanyl)amino-5-bromophenyl-pyrid-2'-yl ketone

Conditions

Conditions	Yield
With dicyclohexyl-carbodiimide In dichloromethane for 120h; Ambient temperature;	76.5%

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 74405-07-5
4-chloro-2,2-dimethyl-2H-benzo[e][1,3]oxazine

: 82562-61-6
[5-Bromo-2-(2,2-dimethyl-2H-benzo[e][1,3]oxazin-4-ylamino)-phenyl]-pyridin-2-yl-methanone

Conditions

Conditions	Yield
In chloroform for 3h; Heating;	70%

: 45214-91-3
(2S)-2-[(tert-butoxy)carbonylamino]-4-(methoxycarbonyl)butanoic acid

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: (S)-methyl 5-((4-bromo-2-nicotinoylphenyl)amino)-4-((tert-butoxycarbonyl)amino)-5-oxopentanoate

Conditions

Conditions	Yield
Stage #1: (2S)-2-[(tert-butoxy)carbonylamino]-4-(methoxycarbonyl)butanoic acid With 4-methyl-morpholine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate In N,N-dimethyl-formamide for 0.5h; Cooling with ice; Stage #2: 2-amino-5-bromobenzoyl pyridine In N,N-dimethyl-formamide	69%

: 1142-20-7
N-Cbz-Ala

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 136295-72-2
2-(N-carbobenzoxy-S-alanyl)amino-5-bromophenyl-pyrid-2'-yl ketone

Conditions

Conditions	Yield
With dicyclohexyl-carbodiimide In dichloromethane for 120h; Ambient temperature;	1.92 g

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 76895-76-6
N,N'-methylenebis<3-(2'-o-pyridoyl-4-bromo)phenyl>-4-imidazolidinone

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 94 percent / pyridine / CH2Cl2 / 0.5 h / 20 °C 2: 2N HCl / methanol; H2O / 7 h / Heating View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 76895-81-3
4-oxo-3-(4-bromo-2-(2-pyridylcarbonyl)phenyl)imidazolidine

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 94 percent / pyridine / CH2Cl2 / 0.5 h / 20 °C 2: 2N HCl / methanol; H2O / 7 h / Heating View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 1812-30-2
bromazepam

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 94 percent / pyridine / CH2Cl2 / 0.5 h / 20 °C 2: 2N HCl / methanol; H2O / 7 h / Heating View Scheme
Multi-step reaction with 2 steps 1: sodium hydrogencarbonate / dichloromethane / 0 - 20 °C 2: ammonia / methanol / 12 h / 0 - 20 °C / Reflux View Scheme
Multi-step reaction with 2 steps 1: sodium hydrogencarbonate / dichloromethane / 2 h / 0 °C 2: ammonia / methanol / 4 h / 0 - 80 °C View Scheme
Multi-step reaction with 2 steps 1: sodium hydrogencarbonate / dichloromethane / Inert atmosphere 2: hexamethylenetetramine; ammonium acetate / isopropyl alcohol / 4 h / Inert atmosphere; Reflux View Scheme
Multi-step reaction with 2 steps 1: sodium hydrogencarbonate / dichloromethane / Inert atmosphere 2: ammonia / dichloromethane; methanol / 0 - 20 °C / Inert atmosphere View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 2-acetamido-7-bromo-5-(2-pyridyl)-3H-1,4-benzodiazepine

Conditions

Conditions	Yield
Multi-step reaction with 4 steps 1: 94 percent / pyridine / CH2Cl2 / 0.5 h / 20 °C 2: 2N HCl / methanol; H2O / 7 h / Heating 3: NH4Cl / methanol; H2O / 17 h / Heating 4: pyridine / 24 h / 20 °C View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 2-amino-7-bromo-5-(2-pyridyl)-3H-1,4-benzodiazepine hydrochloride

Conditions

Conditions	Yield
Multi-step reaction with 3 steps 1: 94 percent / pyridine / CH2Cl2 / 0.5 h / 20 °C 2: 2N HCl / methanol; H2O / 7 h / Heating 3: NH4Cl / methanol; H2O / 17 h / Heating View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 82562-62-7
2-(6-Bromo-4-pyridin-2-yl-quinazolin-2-yl)-phenol

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 70 percent / CHCl3 / 3 h / Heating 2: 88 percent / p-toluenesulfonic acid / toluene / 5 h / Heating View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 136295-75-5
7-bromo-1,3-dihydro-3(S)-methyl-5-(pyrid-2'-yl)-2H-1,4-benzodiazepin-2-one

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 1.92 g / dicyclohexylcarbodiimide / CH2Cl2 / 120 h / Ambient temperature 2: 41.6 percent / H2 / 10percent Pd/C / ethanol; dioxane / 24 h / Ambient temperature View Scheme
Multi-step reaction with 3 steps 1: 1.92 g / dicyclohexylcarbodiimide / CH2Cl2 / 120 h / Ambient temperature 2: trifluoroacetic acid / various solvent(s) / 2.5 h / Heating 3: aq. HCl View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: (S)-2-Amino-N-[4-bromo-2-(pyridine-2-carbonyl)-phenyl]-propionamide

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 1.92 g / dicyclohexylcarbodiimide / CH2Cl2 / 120 h / Ambient temperature 2: trifluoroacetic acid / various solvent(s) / 2.5 h / Heating View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 1,3-dihydro-3(S)-benzyl-5-(pyrid-2'-yl)-2H-1,4-benzodiazepin-2-one

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 1.92 g / dicyclohexylcarbodiimide / CH2Cl2 / 120 h / Ambient temperature 2: 5 percent / H2 / 10percent Pd/C / ethanol; dioxane / 24 h / Ambient temperature View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 136295-76-6
7-bromo-1,3-dihydro-3(S)-benzyl-5-(pyrid-2'-yl)-2H-1,4-benzodiazepin-2-one

Conditions

Conditions	Yield
Multi-step reaction with 3 steps 1: 76.5 percent / dicyclohexylcarbodiimide / CH2Cl2 / 120 h / Ambient temperature 2: trifluoroacetic acid / various solvent(s) / 2.5 h / Heating 3: aq. HCl View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: (S)-2-Amino-N-[4-bromo-2-(pyridine-2-carbonyl)-phenyl]-3-phenyl-propionamide

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 76.5 percent / dicyclohexylcarbodiimide / CH2Cl2 / 120 h / Ambient temperature 2: trifluoroacetic acid / various solvent(s) / 2.5 h / Heating View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 1-benzyl-7-bromo-1,3-dihydro-3(S)-benzyl-5-(pyrid-2'-yl)-2H-1,4-benzodiazepin-2-one

Conditions

Conditions	Yield
Multi-step reaction with 4 steps 1: 76.5 percent / dicyclohexylcarbodiimide / CH2Cl2 / 120 h / Ambient temperature 2: trifluoroacetic acid / various solvent(s) / 2.5 h / Heating 3: aq. HCl 4: 1) sodium methoxide, 2) sodium iodide, sodium methoxide / 1) toluene, 80 deg C, 2) a) acetonitrile, reflux, 20 h, b) 2 h View Scheme

: 1563-56-0
2-amino-5-bromobenzoyl pyridine

: 2-(N-carbobenzoxy-S-alanyl)-amino-5-bromophenyl-pyrid-2'-yl carbinol

Conditions

Conditions	Yield
Multi-step reaction with 2 steps 1: 1.92 g / dicyclohexylcarbodiimide / CH2Cl2 / 120 h / Ambient temperature 2: 11 percent / H2 / 10percent Pd/C / ethanol; dioxane / 24 h / Ambient temperature View Scheme

2-(2-Amino-5-bromobenzoyl)pyridine Specification

The Methanone,(2-amino-5-bromophenyl)-2-pyridinyl- is an organic compound with the formula C₁₂H₉BrN₂O. The systematic name of this chemical is (2-Amino-5-bromophenyl)(pyridin-2-yl)methanone. With the CAS registry number 1563-56-0, it is also named as 2-Amino-5-bromobenzoylpyridine. The product's category is Intermediate of Bromazepam. Besides, its molecular weight is 277.12.

Physical properties about Methanone,(2-amino-5-bromophenyl)-2-pyridinyl- are: (1)ACD/LogP: 2.51; (2)ACD/LogD (pH 5.5): 2.51; (3)ACD/LogD (pH 7.4): 2.51; (4)ACD/BCF (pH 5.5): 47.64; (5)ACD/BCF (pH 7.4): 47.64; (6)ACD/KOC (pH 5.5): 552.99; (7)ACD/KOC (pH 7.4): 553; (8)#H bond acceptors: 3; (9)#H bond donors: 2; (10)#Freely Rotating Bonds: 3; (11)Polar Surface Area: 33.2 Å²; (12)Index of Refraction: 1.658; (13)Molar Refractivity: 66.06 cm³; (14)Molar Volume: 179.2 cm³; (15)Polarizability: 26.18×10^-24 cm³; (16)Surface Tension: 59.3 dyne/cm; (17)Density: 1.546 g/cm³; (18)Flash Point: 226.7 °C; (19)Enthalpy of Vaporization: 71.02 kJ/mol; (20)Boiling Point: 451.2 °C at 760 mmHg; (21)Vapour Pressure: 2.48E-08 mmHg at 25 °C.

Uses of Methanone,(2-amino-5-bromophenyl)-2-pyridinyl-: it can be used to produce 2-Amino-5-bromobenzoylpyridine. It will need reagent dicyclohexylcarbodiimide and solvent CH₂Cl₂ with reaction time of 5 days. The yield is about 76.5%.

When you are using this chemical, please be cautious about it as the following:
It is harmful by inhalation, in contact with skin and if swallowed. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Besides, this chemical is irritating to eyes, respiratory system and skin. When you are using it, wear suitable gloves and eye/face protection. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)InChI: InChI=1/C12H9BrN2O/c13-8-4-5-10(14)9(7-8)12(16)11-3-1-2-6-15-11/h1-7H,14H2
(2)InChIKey: KHVZPFKJBLTYCC-UHFFFAOYAI
(3)Std. InChI: InChI=1S/C12H9BrN2O/c13-8-4-5-10(14)9(7-8)12(16)11-3-1-2-6-15-11/h1-7H,14H2
(4)Std. InChIKey: KHVZPFKJBLTYCC-UHFFFAOYSA-N

Product Name

2-(2-AMINO-5-BROMOBENZOYL) PYRIDINE

Synthetic route

2-(2-Amino-5-bromobenzoyl)pyridine Specification

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