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Dyes and pigments

Aurin

Also known as Corallin, Aurine, 4,4'-Dihydroxyfuchsone

CAS 603-45-2Formula C19H14O3Molar mass 290.32 g/molEC 210-041-8
GHS signal word: Warning. Pictograms: Harmful or irritant 13 suppliers listed
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Aurin chemical structure, C19H14O3, CAS 603-45-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
603-45-2
Formula
C19H14O3
Molar mass
290.32 g/mol
EC number
210-041-8
HS code
291450
Category
Dyes and pigments

What is Aurin?

Plain description, key identifiers and synonyms

Aurin is a diarylmethane.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-[bis(4-hydroxyphenyl)methylidene]cyclohexa-2,5-dien-1-one
CAS number
603-45-2 CAS number cross-checked
EC number
210-041-8
Molecular formula
C19H14O3
UNII
85N4AK3JAU
MDL number
MFCD00001624
InChIKey
FYEHYMARPSSOBO-UHFFFAOYSA-N
InChI
InChI=1S/C19H14O3/c20-16-7-1-13(2-8-16)19(14-3-9-17(21)10-4-14)15-5-11-18(22)12-6-15/h1-12,20-21H
SMILES (canonical and isomeric)
C1=CC(=O)C=CC1=C(C2=CC=C(C=C2)O)C3=CC=C(C=C3)O

Synonyms

  • Corallin
  • Aurine
  • 4,4'-Dihydroxyfuchsone
  • Aurin No. 555
  • C.I. 43800
  • 2,5-Cyclohexadien-1-one, 4-[bis(4-hydroxyphenyl)methylene]-
  • 4-[bis(4-hydroxyphenyl)methylene]cyclohexa-2,5-dien-1-one
  • 4-(Bis(4-hydroxyphenyl)methylene)cyclohexa-2,5-dien-1-one
  • 2,5-Cyclohexadien-1-one, 4-(bis(4-hydroxyphenyl)methylene)-
  • 4-(Bis(p-hydroxyphenyl)methylene)cyclohexa-2,5-dien-1-one
  • 4(bis(p-hydroxyphenyl)methylene)-2,5-cyclohexadien-1-one
  • rosolic acid
  • p-Rosolic acid
  • 4-(Bis(4-hydroxyphenyl)methylene)cyclohexa-2,5-dienone
  • Pararosolic Acid
  • 4-[bis(4-hydroxyphenyl)methylidene]cyclohexa-2,5-dien-1-one
  • 4-[Bis(4-hydroxyphenyl)methylene]-2,5-cyclohexadienone
  • 2,5-Cyclohexadien-1-one, 4-(bis(p-hydroxyphenyl)methylene)-
  • Corallin yellow
  • 4-[Bis(4-hydroxyphenyl)methylene]-2,5-cyclohexadien-1-one
  • Corallin yellow (Salt/Mix)
  • p-Rosolic acid, 85.0%
  • Corallin (free acid)
  • DivK1c_000400
  • p-Rosolic acid, JIS special grade
Show all 31 synonyms
  • p-Rosolic acid, Dye content 85 %
  • 2, 4-[bis(p-hydroxyphenyl)methylene]-
  • 2, 4-[bis(4-hydroxyphenyl)methylene]-
  • 2,5-Cyclohexadien-1-one, 4-[bis(p-hydroxyphenyl)]methylene-
  • 4-[Bis(4-hydroxyphenyl)methylene]-2,5-cyclohexadien-1-one #
  • 4-(P,P'-Dihydroxybenzhydrylidene)-2,5-cyclohexadien-1-one

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
290.32 g/molcalc.
Exact mass
290.0943 Dacalc.
LogP (octanol/water)
3.59calc.
Topological polar surface area
57.53 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
22calc.
Rings
3calc.
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, O=C1C=CC(=C(c2ccccc2)c2ccccc2)C=C1

O=C1C=CC(=C(c2ccccc2)c2ccccc2)C=C1

3 rings, 20 atoms, the 4-Benzhydrylidenecyclohexa-2,5-dien-1-one ring system.

101 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

Aurin suppliers

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

All 13 suppliers
13 of 13 offers

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

13 suppliers in 2 countries

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Aurin price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce, Regulatory flags: Added by a premanufacture notice

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2914.50Indicative HS code

Ketone-phenols and ketones with other oxygen function

World exports in 2024
$438M
+10.9% vs 2023, imports $420M
2019 to 2024
Top exporters
  1. China50.5%
  2. India * partner reported11.6%
  3. United States11.3%
Top importers
  1. United States20.8%
  2. Germany10.0%
  3. Netherlands8.6%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Aurin?

Aurin is a diarylmethane.

What is the CAS number of Aurin?

The CAS registry number of Aurin is 603-45-2.

What is the molecular formula and weight of Aurin?

The molecular formula of Aurin is C19H14O3 and its molar mass is 290.32 g/mol.

Is Aurin hazardous?

Aurin 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 Aurin?

Aurin is usually classified under HS code 291450 (Ketone-phenols and ketones with other oxygen function). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Aurin?

CompoundList lists 13 suppliers of Aurin in India and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Aurin in India?

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

What is the price of Aurin?

Suppliers quote Aurin 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 Aurin

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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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