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Acid and mordant dyes

Solvent Red 72

Also known as Dibromofluorescein, C.I. Acid Orange 11, Eosine 2J

CAS 4372-02-5Formula C20H8Br2Na2O5Molar mass 534.07 g/molEC 224-468-2
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Solvent Red 72 chemical structure, C20H8Br2Na2O5, CAS 4372-02-5
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
4372-02-5
Formula
C20H8Br2Na2O5
Molar mass
534.07 g/mol
EC number
224-468-2
HS code
320419
Category
Acid and mordant dyes

What is Solvent Red 72?

Plain description, key identifiers and synonyms

Solvent Red 72 is a chemical substance with the molecular formula C20H8Br2Na2O5 and a molar mass of 534.07 g/mol. Its CAS registry number is 4372-02-5. The IUPAC name is disodium, 4',5'-dibromo-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
disodium, 4',5'-dibromo-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate
CAS number
4372-02-5 CAS number cross-checked
EC number
224-468-2
Molecular formula
C20H8Br2Na2O5
UNII
7MF02AWG95
INCI name
CI 45370
InChIKey
REXANTGEEZXBSJ-UHFFFAOYSA-L
InChI
InChI=1S/C20H10Br2O5.2Na/c21-15-13(23)7-5-11-17(15)26-18-12(6-8-14(24)16(18)22)20(11)10-4-2-1-3-9(10)19(25)27-20;;/h1-8,23-24H;;/q;2*+1/p-2
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C(=O)OC23C4=C(C(=C(C=C4)[O-])Br)OC5=C3C=CC(=C5Br)[O-].[Na+].[Na+]

Synonyms

  • Dibromofluorescein
  • C.I. Acid Orange 11
  • Eosine 2J
  • Bromo Acid Yellowish
  • Eosine S 10
  • 4',5'-Dibromfluorescein
  • D and C Orange No. 6
  • C.I. 45370
  • Fluorescein, 4',5'-dibromo-, disodium salt
  • Fluorescein, 4',5'-dibromo-, sodium deriv., sodium salt
  • Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 4',5'-dibromo-3',6'-dihydroxy-, disodium salt
  • Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 4',5'-dibromo-3',6'-dihydroxy-, disodium salt
  • CI 45370
  • Benzoic acid, 2-(4,5-dibromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)-, disodium salt
  • Benzoic acid, 2-(4,5-dibromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)-, sodium salt (1:2)
  • Orange no. 201
  • Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 4',5'-dibromo-3',6'-dihydroxy-, sodium salt (1:2)
  • Acid orange 11
  • disodium, 4',5'-dibromo-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate
  • Acid Orange 11CI 45370:1
  • Disodium 2-(4,5-dibromo-6-oxido-3-oxoxanthen-9-yl)benzoate
  • Disodium 4',5'-dibromo-3-oxo-3H-spiro[[2]benzofuran-1,9'-xanthene]-3',6'-bis(olate)
  • sodium 4',5'-dibromo-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-3',6'-bis(olate)
  • Disodium 4',5'-dibromo-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthene]-3',6'-bis(olate)

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
534.07 g/molcalc.
Exact mass
531.8534 Dacalc.
LogP (octanol/water)
-2.07calc.
Topological polar surface area
81.65 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
0calc.
Heavy atoms
29calc.
Rings
5calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.05calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.
Lipinski rule of five
Passes (1 violation)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=C1OC2(c3ccccc3Oc3ccccc32)c2ccccc21

O=C1OC2(c3ccccc3Oc3ccccc32)c2ccccc21

5 rings, 23 atoms, the Fluoran ring system.

438 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.

Solvent Red 72 suppliers

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Solvent Red 72 price

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Uses and applications

What the substance is used for, by industry and function

Use classes: Cosmetics.

Cosmetic ingredient, INCI name CI 45370(colorant)

Functional uses

  • Dye

Cosmetic functions

  • Colorant

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Solvent Red 72 is traded under.

HS 3204.19Indicative HS code

Synthetic organic colouring matter and preparations based thereon as specified in note 3…

World exports in 2024
$1.08B
+0.2% vs 2023, imports $1.14B
2019 to 2024
Top exporters
  1. United States23.7%
  2. India * partner reported12.4%
  3. China9.0%
Top importers
  1. Germany7.5%
  2. France * partner reported6.4%
  3. Mexico5.4%

* Partner reported figures, a lower bound.

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

The HS code shown for Solvent Red 72 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Solvent Red 72, based on the data on this page

What is Solvent Red 72?

Solvent Red 72 is a chemical substance with the molecular formula C20H8Br2Na2O5 and a molar mass of 534.07 g/mol. Its CAS registry number is 4372-02-5. The IUPAC name is disodium, 4',5'-dibromo-3-oxospiro[2-benzofuran-1,9'-xanthene]-3',6'-diolate.

What is the CAS number of Solvent Red 72?

The CAS registry number of Solvent Red 72 is 4372-02-5.

What is the molecular formula and weight of Solvent Red 72?

The molecular formula of Solvent Red 72 is C20H8Br2Na2O5 and its molar mass is 534.07 g/mol.

What is Solvent Red 72 used for?

Use classes: Cosmetics.

Is Solvent Red 72 hazardous?

No GHS hazard classification for Solvent Red 72 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 Solvent Red 72?

Solvent Red 72 is usually classified under HS code 320419 (Synthetic organic colouring matter and preparations based thereon as specified in note 3…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Solvent Red 72?

Post a free request on CompoundList and suppliers of Solvent Red 72 will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Solvent Red 72?

Suppliers quote Solvent Red 72 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

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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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