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Heterocyclic building blocks

Pyridine, 2-(hydroxyazo)-, (E)

Also known as N-pyridin-2-ylnitrous amide, N-(Pyridin-2-yl)nitrous amide, 2-Pyridinamine,N-nitroso-(9CI)

CAS 18883-95-9Formula C5H5N3OMolar mass 123.12 g/mol
1 supplier listed
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Pyridine, 2-(hydroxyazo)-, (E) chemical structure, C5H5N3O, CAS 18883-95-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
18883-95-9
Formula
C5H5N3O
Molar mass
123.12 g/mol
HS code
293339
Category
Heterocyclic building blocks

What is Pyridine, 2-(hydroxyazo)-, (E)?

Plain description, key identifiers and synonyms

Pyridine, 2-(hydroxyazo)-, (E) is a chemical substance with the molecular formula C5H5N3O and a molar mass of 123.12 g/mol. Its CAS registry number is 18883-95-9. The IUPAC name is N-pyridin-2-ylnitrous amide.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
N-pyridin-2-ylnitrous amide
CAS number
18883-95-9 CAS number cross-checkedOther or deprecated CAS: 113583-98-5
Molecular formula
C5H5N3O
InChIKey
ULQMUQUHCSHQAT-UHFFFAOYSA-N
InChI
InChI=1S/C5H5N3O/c9-8-7-5-3-1-2-4-6-5/h1-4H,(H,6,7,9)
SMILES (canonical and isomeric)
C1=CC=NC(=C1)NN=O

Synonyms

  • N-pyridin-2-ylnitrous amide
  • N-(Pyridin-2-yl)nitrous amide
  • 2-Pyridinamine,N-nitroso-(9CI)
  • pyridyl-2-hydrazone
  • N-nitroso-2-Pyridinamine
  • (E)-2-(Hydroxydiazenyl)pyridine

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
123.12 g/molcalc.
Exact mass
123.0433 Dacalc.
LogP (octanol/water)
1.17calc.
Topological polar surface area
54.35 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
9calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, c1ccncc1

c1ccncc1

1 ring, 6 atoms, the Pyridine ring system.

118,162 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Pyridine, 2-(hydroxyazo)-, (E) suppliers

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Where suppliers are based

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Pyridine, 2-(hydroxyazo)-, (E) price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Pyridine, 2-(hydroxyazo)-, (E) is traded under.

HS 2933.39Indicative HS code

Heterocyclic compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure…

World exports in 2024
$9.16B
−17.9% vs 2023, imports $10.6B
2019 to 2024
Top exporters
  1. China21.5%
  2. India * partner reported12.3%
  3. Ireland11.6%
Top importers
  1. Germany14.2%
  2. United States12.8%
  3. Brazil10.1%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Pyridine, 2-(hydroxyazo)-, (E) is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Pyridine, 2-(hydroxyazo)-, (E), based on the data on this page

What is Pyridine, 2-(hydroxyazo)-, (E)?

Pyridine, 2-(hydroxyazo)-, (E) is a chemical substance with the molecular formula C5H5N3O and a molar mass of 123.12 g/mol. Its CAS registry number is 18883-95-9. The IUPAC name is N-pyridin-2-ylnitrous amide.

What is the CAS number of Pyridine, 2-(hydroxyazo)-, (E)?

The CAS registry number of Pyridine, 2-(hydroxyazo)-, (E) is 18883-95-9. Other or deprecated CAS numbers: 113583-98-5.

What is the molecular formula and weight of Pyridine, 2-(hydroxyazo)-, (E)?

The molecular formula of Pyridine, 2-(hydroxyazo)-, (E) is C5H5N3O and its molar mass is 123.12 g/mol.

What is Pyridine, 2-(hydroxyazo)-, (E) used for?

Known uses and roles of Pyridine, 2-(hydroxyazo)-, (E) include building blocks in research and laboratory and screening compounds in research and laboratory.

Is Pyridine, 2-(hydroxyazo)-, (E) hazardous?

No GHS hazard classification for Pyridine, 2-(hydroxyazo)-, (E) is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Pyridine, 2-(hydroxyazo)-, (E)?

Pyridine, 2-(hydroxyazo)-, (E) is usually classified under HS code 293339 (Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Pyridine, 2-(hydroxyazo)-, (E)?

CompoundList lists 1 supplier of Pyridine, 2-(hydroxyazo)-, (E) in China. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Pyridine, 2-(hydroxyazo)-, (E)?

Suppliers quote Pyridine, 2-(hydroxyazo)-, (E) on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Pyridine, 2-(hydroxyazo)-, (E)

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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