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Heterocyclic building blocks

HOAt

Also known as 1-Hydroxy-7-azabenzotriazole, 7-Aza-1-hydroxybenzotriazole, 3H-[1,2,3]triazolo[4,5-b]pyridin-3-ol

CAS 39968-33-7Formula C5H4N4OMolar mass 136.11 g/molEC 433-840-5
GHS signal word: Danger. Pictograms: Corrosive, Acute toxicity (severe), Harmful or irritant 14 suppliers listed
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HOAt chemical structure, C5H4N4O, CAS 39968-33-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
39968-33-7
Formula
C5H4N4O
Molar mass
136.11 g/mol
EC number
433-840-5
HS code
293399
Category
Heterocyclic building blocks

What is HOAt?

Plain description, key identifiers and synonyms

HOAt is a chemical substance with the molecular formula C5H4N4O and a molar mass of 136.11 g/mol. Its CAS registry number is 39968-33-7. The IUPAC name is 3-hydroxytriazolo[4,5-b]pyridine.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3-hydroxytriazolo[4,5-b]pyridine
CAS number
39968-33-7 CAS number cross-checkedOther or deprecated CAS: 57115-46-5
EC numbers
433-840-5, 609-760-3
Molecular formula
C5H4N4O
UNII
TX8XYH09H0
MDL number
MFCD00210053
InChIKey
FPIRBHDGWMWJEP-UHFFFAOYSA-N
InChI
InChI=1S/C5H4N4O/c10-9-5-4(7-8-9)2-1-3-6-5/h1-3,10H
SMILES (canonical and isomeric)
C1=CC2=C(N=C1)N(N=N2)O

Synonyms

  • 1-Hydroxy-7-azabenzotriazole
  • 7-Aza-1-hydroxybenzotriazole
  • 3H-[1,2,3]triazolo[4,5-b]pyridin-3-ol
  • 3-hydroxytriazolo[4,5-b]pyridine
  • 3H-1,2,3-Triazolo[4,5-b]pyridine, 3-hydroxy-
  • 1-hydroxyl-7-azabenzotriazole
  • 3H-(1,2,3)triazolo(4,5-b)pyridin-3-ol
  • HOAT solution
  • 1,2,3-triazolo[5,4-b]pyridin-3-ol
  • [1,2,3]Triazolo[4,5-b]pyridin-3-ol
  • HOAt 1-Hydroxy-7-azabenzotriazole
  • 3H-1,2,3-triazolo[4,5-b]pyridine-3-ol
  • (1,2,3)Triazolo(4,5-b)pyridin-3-ol
  • 3H-1,2,3-Triazolo(4,5-b)pyridine, 3-hydroxy-
  • 3H-1,2,3-Triazolo(4,5-b)pyridine-3-ol
  • 1-Hydroxy-7-azabenzotriazole (HOAt)
  • 1-Hydroxy-7-azabenzotriazole(wetted with water >15%)
  • HOAT [1-Hydroxy-7-azabenzotriazole]
  • 3H-1,2,3-Triazolo[4,5-b]pyridin-3-ol
  • HOAt Form I
  • HOAt Form II
  • 1-Hydroxy-7-azabenzotriazole solution
  • 1-hydroxy-7azabenzotriazole
  • 1-hydroxy-t-axabenzotrazole
  • 1-hydroxy-7-azabenzotriazol
Show all 35 synonyms
  • 1-hydroxy-7-azabenztriazole
  • 1-hydroxy-7 azabenzotriazole
  • HOAt - 0.6M in DMF
  • 1-hydroxy-7-aza-benzotriazole
  • 1-hydroxy-7-azabenzo-triazole
  • 1-hydroxy-7-aza-1H-1,2,3-benzotriazole
  • 3H-[1,2,3]-Triazolo[4,5-b]pyridin-3-ol
  • 1-Hydroxy-1H-v-triazolo(4,5-b)pyridine
  • 1-Hydroxy-7-azabenzotriazole solution, 1 M in DMA
  • 1-Hydroxy-7-azabenzotriazol, 0.6 M solution in DMF

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
136.11 g/molcalc.
Exact mass
136.0385 Dacalc.
LogP (octanol/water)
0.06calc.
Topological polar surface area
63.83 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
0calc.
Heavy atoms
10calc.
Rings
2calc.
Aromatic rings
2calc.
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, c1cnc2n[nH]nc2c1

c1cnc2n[nH]nc2c1

2 rings, 9 atoms, the 1H-1,2,3-Triazolo(4,5-b)pyridine ring system.

317 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H204Fire or projection hazard.
  • H301Toxic if swallowed.
  • H302Harmful if swallowed.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (31)
  • P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
  • P230Keep wetted with water or another suitable desensitiser.
  • P234Keep only in original packaging.
  • P236Keep only in original packaging, division in transport.
  • P240Ground and bond container and receiving equipment.
  • P250Do not subject to grinding, shock or friction.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P317Get medical help.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P370 + P380 + P375In case of fire: Evacuate area. Fight fire remotely due to the risk of explosion.
  • P401Store in accordance with local regulations.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
  • P503Refer to manufacturer, supplier or local authority for information on disposal, recovery or recycling.

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

Full safety data and first aid

HOAt suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 14 suppliers
14 of 14 offers
  • Syntal Chemicals SP Z O O
    Poland, Gliwice ManufacturerUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
    View
  • hychemm.com
    China ManufacturerUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
    View
  • TRC Finechems
    India, Nashik ManufacturerUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
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  • AgroIntelBioScan.com
    Singapore, SingaporeUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
    View
  • Alinda Chemical Trade Company Ltd
    Hong Kong, Hong KongUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
    View
  • Allbio Pharm Co., Ltd.
    China, SuzhouUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
    View
  • Biopharma PEG Scientific Inc
    United States, WatertownUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
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  • BroadPharm
    United States, San DiegoUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
    View
  • DSL Chemicals Co., Ltd.
    China, ShanghaiUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
    View
  • Hunan Chemfish Pharmaceutical Co., Ltd.
    China, ChangshaUnclaimed profile
    HOAtGrade, purity and minimum order on request
    Price on request
    View

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

14 suppliers in 7 countries

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HOAt 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 HOAt is traded under.

HS 2933.99Indicative HS code

Heterocyclic compounds with nitrogen hetero-atom(s) only, other

World exports in 2024
$12.1B
−31.0% vs 2023, imports $28.8B
2019 to 2024
Top exporters
  1. China30.5%
  2. India * partner reported16.3%
  3. Ireland9.0%
Top importers
  1. Slovenia31.7%
  2. Italy24.2%
  3. United States5.0%

* Partner reported figures, a lower bound.

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

The HS code shown for HOAt is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about HOAt, based on the data on this page

What is HOAt?

HOAt is a chemical substance with the molecular formula C5H4N4O and a molar mass of 136.11 g/mol. Its CAS registry number is 39968-33-7. The IUPAC name is 3-hydroxytriazolo[4,5-b]pyridine.

What is the CAS number of HOAt?

The CAS registry number of HOAt is 39968-33-7. Other or deprecated CAS numbers: 57115-46-5.

What is the molecular formula and weight of HOAt?

The molecular formula of HOAt is C5H4N4O and its molar mass is 136.11 g/mol.

What is HOAt used for?

Known uses and roles of HOAt include building blocks in research and laboratory and screening compounds in research and laboratory.

Is HOAt hazardous?

HOAt carries the GHS signal word "Danger". Main hazards: fire or projection hazard, toxic if swallowed, harmful if swallowed. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of HOAt?

HOAt is usually classified under HS code 293399 (Heterocyclic compounds with nitrogen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy HOAt?

CompoundList lists 14 suppliers of HOAt in China, United States, Canada, Hong Kong and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy HOAt in India?

1 supplier in India list HOAt on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of HOAt?

Suppliers quote HOAt 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 HOAt

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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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