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Phenols

Croconic acid

Also known as Crocic acid, 4,5-Dihydroxy-4-cyclopentene-1,2,3-trione, 1,2-Dihydroxycyclopentene-3,4,5-trione

CAS 488-86-8Formula C5H2O5Molar mass 142.07 g/molEC 676-473-8
GHS signal word: Warning. Pictograms: Harmful or irritant 1 supplier listed
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Croconic acid chemical structure, C5H2O5, CAS 488-86-8
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
488-86-8
Formula
C5H2O5
Molar mass
142.07 g/mol
EC number
676-473-8
HS code
290729
Category
Phenols

What is Croconic acid?

Plain description, key identifiers and synonyms

Croconic acid is a chemical substance with the molecular formula C5H2O5 and a molar mass of 142.07 g/mol. Its CAS registry number is 488-86-8. The IUPAC name is 4,5-dihydroxycyclopent-4-ene-1,2,3-trione.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4,5-dihydroxycyclopent-4-ene-1,2,3-trione
CAS number
488-86-8 CAS number cross-checked
EC number
676-473-8
Molecular formula
C5H2O5
UNII
6HGY35UXAA
MDL number
MFCD00181389
InChIKey
RBSLJAJQOVYTRQ-UHFFFAOYSA-N
InChI
InChI=1S/C5H2O5/c6-1-2(7)4(9)5(10)3(1)8/h6-7H
SMILES (canonical and isomeric)
C1(=C(C(=O)C(=O)C1=O)O)O

Synonyms

  • Crocic acid
  • 4,5-Dihydroxy-4-cyclopentene-1,2,3-trione
  • 1,2-Dihydroxycyclopentene-3,4,5-trione
  • 4,5-dihydroxycyclopent-4-ene-1,2,3-trione
  • Croconic acid, 98%
  • 4,5-Dihydroxy-4-cyclopentene-1,2,3-trione #
  • 4-Cyclopentene-1,2,3-trione, 4,5-dihydroxy-
  • 1,2-Dihydroxy-3,4,5-trioxocyclopent-1-ene

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
142.07 g/molcalc.
Exact mass
141.9902 Dacalc.
LogP (octanol/water)
-1.95calc.
Topological polar surface area
91.67 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
0calc.
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=c1ccc(=O)c1=O

O=c1ccc(=O)c1=O

1 ring, 8 atoms, the Cyclopent-4-ene-1,2,3-trione ring system.

5 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

Croconic acid suppliers

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Where suppliers are based

1 supplier in 1 country

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Croconic 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

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 Croconic acid is traded under.

HS 2907.29Indicative HS code

Polyphenols, phenol-alcohols, other

World exports in 2024
$535M
−27.0% vs 2023, imports $565M
2019 to 2024
Top exporters
  1. India * partner reported17.7%
  2. Germany16.5%
  3. Japan15.8%
Top importers
  1. United States13.1%
  2. Japan8.0%
  3. Belgium7.9%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Croconic acid?

Croconic acid is a chemical substance with the molecular formula C5H2O5 and a molar mass of 142.07 g/mol. Its CAS registry number is 488-86-8. The IUPAC name is 4,5-dihydroxycyclopent-4-ene-1,2,3-trione.

What is the CAS number of Croconic acid?

The CAS registry number of Croconic acid is 488-86-8.

What is the molecular formula and weight of Croconic acid?

The molecular formula of Croconic acid is C5H2O5 and its molar mass is 142.07 g/mol.

What is Croconic acid used for?

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

Is Croconic acid hazardous?

Croconic 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 Croconic acid?

Croconic acid is usually classified under HS code 290729 (Polyphenols, phenol-alcohols, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Croconic acid?

CompoundList lists 1 supplier of Croconic acid 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 Croconic acid?

Suppliers quote Croconic 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 Croconic 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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