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Heterocyclic building blocks

Coumalic acid

Also known as Cumalic acid, 2H-Pyran-5-carboxylic acid, 2-oxo-, 2-Oxopyran-5-carboxylic acid

CAS 500-05-0Formula C6H4O4Molar mass 140.09 g/molEC 207-899-0
GHS signal word: Warning. Pictograms: Harmful or irritant 12 suppliers listed
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Coumalic acid chemical structure, C6H4O4, CAS 500-05-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
500-05-0
Formula
C6H4O4
Molar mass
140.09 g/mol
EC number
207-899-0
HS code
293220
Category
Heterocyclic building blocks

What is Coumalic acid?

Plain description, key identifiers and synonyms

Coumalic acid is a pyranone.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
6-oxopyran-3-carboxylic acid
CAS number
500-05-0 CAS number cross-checked
EC number
207-899-0
Molecular formula
C6H4O4
UNII
OB1JPY343G
MDL number
MFCD00006644
InChIKey
ORGPJDKNYMVLFL-UHFFFAOYSA-N
InChI
InChI=1S/C6H4O4/c7-5-2-1-4(3-10-5)6(8)9/h1-3H,(H,8,9)
SMILES (canonical and isomeric)
C1=CC(=O)OC=C1C(=O)O

Synonyms

  • Cumalic acid
  • 2H-Pyran-5-carboxylic acid, 2-oxo-
  • 2-Oxopyran-5-carboxylic acid
  • alpha-Pyrone-5-carboxylic acid
  • 2-Oxo-1,2H-pyran-5-carboxylic acid
  • 2-Pentenedioic acid, 4-(hydroxymethylene)-, delta-lactone
  • 2-Oxo-2H-pyran-5-carboxylic acid
  • 6-oxopyran-3-carboxylic acid
  • 2-Pyrone-5-carboxylic acid
  • Coumalicacid
  • cumaric acid
  • Coumalic acid, 97%
  • 6-oxo-pyran-3-carboxylic acid
  • alpha-Pyrone-3-carboxylic acid
  • 2-Oxo-2H-pyran-5-carboxylic acid #
  • 2-Pentenedioic acid, delta-lactone
  • 2-Oxo-1(2H)-pyran-5-carboxylic acid
  • Glutaconic acid, 4-(hydroxymethylene)-, delta-lactone

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
140.09 g/molcalc.
Exact mass
140.011 Dacalc.
LogP (octanol/water)
0.34calc.
Topological polar surface area
67.51 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
1calc.
Heavy atoms
10calc.
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, O=c1cccco1

O=c1cccco1

1 ring, 7 atoms, the 2H-Pyran-2-one ring system.

509 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • 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.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • 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.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

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

Coumalic acid suppliers

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All 12 suppliers
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Where suppliers are based

12 suppliers in 6 countries

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Coumalic acid 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

United States

  • TSCA inventory (USA)
    Status: Inactive in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Coumalic acid is traded under.

HS 2932.20Indicative HS code

Lactones

World exports in 2024
$1.97B
−4.7% vs 2023, imports $2.07B
2019 to 2024
Top exporters
  1. China56.3%
  2. India * partner reported7.4%
  3. Germany7.3%
Top importers
  1. United States14.2%
  2. India * partner reported13.5%
  3. Brazil8.5%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Coumalic acid, based on the data on this page

What is Coumalic acid?

Coumalic acid is a pyranone.

What is the CAS number of Coumalic acid?

The CAS registry number of Coumalic acid is 500-05-0.

What is the molecular formula and weight of Coumalic acid?

The molecular formula of Coumalic acid is C6H4O4 and its molar mass is 140.09 g/mol.

What is Coumalic acid used for?

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

Is Coumalic acid hazardous?

Coumalic acid carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Coumalic acid?

Coumalic acid is usually classified under HS code 293220 (Lactones). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Coumalic acid?

CompoundList lists 12 suppliers of Coumalic acid in United States, China, Canada, Hong Kong and 2 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Coumalic acid in India?

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

What is the price of Coumalic acid?

Suppliers quote Coumalic acid 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 Coumalic acid

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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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