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Basic and cationic dyes

Solvent Red 49

Also known as Rhodamine B base, C.I. Solvent Red 49, Rhodamine B lactone

CAS 509-34-2Formula C28H30N2O3Molar mass 442.56 g/molEC 208-096-8
GHS signal word: Danger. Pictograms: Corrosive, Harmful or irritant, Hazardous to the environment 19 suppliers listed
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Solvent Red 49 chemical structure, C28H30N2O3, CAS 509-34-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
509-34-2
Formula
C28H30N2O3
Molar mass
442.56 g/mol
EC number
208-096-8
HS code
320419
Category
Basic and cationic dyes

What is Solvent Red 49?

Plain description, key identifiers and synonyms

Solvent Red 49 is a chemical substance with the molecular formula C28H30N2O3 and a molar mass of 442.56 g/mol. Its CAS registry number is 509-34-2. The IUPAC name is 3',6'-bis(diethylamino)spiro[2-benzofuran-3,9'-xanthene]-1-one.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3',6'-bis(diethylamino)spiro[2-benzofuran-3,9'-xanthene]-1-one
CAS number
509-34-2 CAS number cross-checked
EC number
208-096-8
Molecular formula
C28H30N2O3
UNII
KMK3588HID
MDL number
MFCD00066967, MFCD00142140
InChIKey
DZNJMLVCIZGWSC-UHFFFAOYSA-N
InChI
InChI=1S/C28H30N2O3/c1-5-29(6-2)19-13-15-23-25(17-19)32-26-18-20(30(7-3)8-4)14-16-24(26)28(23)22-12-10-9-11-21(22)27(31)33-28/h9-18H,5-8H2,1-4H3
SMILES (canonical and isomeric)
CCN(CC)C1=CC2=C(C=C1)C3(C4=C(O2)C=C(C=C4)N(CC)CC)C5=CC=CC=C5C(=O)O3

Synonyms

  • Rhodamine B base
  • C.I. Solvent Red 49
  • Rhodamine B lactone
  • Lacquer Pink S
  • Rhodamine S lactone
  • Eljon Magenta Toner
  • Waxoline Rhodamine B
  • Waxoline Rhodamine BS
  • Aizen Rhodamine B Base
  • Rhodamine B Base Extra
  • Rhodamine B Extra Base
  • Rhodamine Base B Extra
  • Rhodamine base b
  • AIZEN SOT PINK 1
  • Fluoran, 3',6'-bis(diethylamino)-
  • BASO RED 546
  • 3',6'-Bis(diethylamino)spiro(isobenzofuran-1(3H),9'-(9H)xanthene)-3-one
  • 3',6'-bis(Diethylamino)spiro[isobenzofuran-1(3H),9'-[9H]xanthene]-3-one
  • 9-(2-Carboxyphenyl)-3,6-bis(diethylamino)-9-hydroxy-9H-xanthenelactone
  • Spiro(isobenzofuran-1(3H),9'-(9H)xanthen)-3-one, 3',6'-bis(diethylamino)-
  • 3',6'-Bis(diethylamino)-3H-spiro(2-benzofuran-1,9'-xanthen)-3-one
  • 3',6'-Bis(diethylamino)-3-oxospiro(isobenzofuran-1(3H),9'-(9H)xanthene)
  • 3,6-Bis(diethylamino)spiro(9H-xanthene-9,1'(3'h)-isobenzofuran)-3'-one
  • Spiro[isobenzofuran-1(3H),9'-[9H]xanthen]-3-one, 3',6'-bis(diethylamino)-
  • Fluoran, 3',6'-bis(diethylamino)-(8CI)
Show all 32 synonyms
  • 3',6'-bis(diethylamino)spiro[2-benzofuran-3,9'-xanthene]-1-one
  • 3',6'-Bis(diethylamino)-3H-spiro[isobenzofuran-1,9'-xanthen]-3-one
  • 12,15-bis(diethylamino)spiro[3-hydroisobenzofuran-3,9'-xanthene]-1-one
  • Fluoran,6'-bis(diethylamino)-
  • Spiro[isobenzofuran-1(3H), 3',6'-bis(diethylamino)-
  • 3',6'-bis(diethylamino)spiro[isobenzofuran-3,9'-xanthene]-1-one
  • 3',6'-Bis(diethylamino)-3H-spiro[[2]benzofuran-1,9'-xanthen]-3-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
442.56 g/molcalc.
Exact mass
442.2256 Dacalc.
LogP (octanol/water)
5.95calc.
Topological polar surface area
42.01 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
6calc.
Heavy atoms
33calc.
Rings
5calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.32calc.
Formal charge
0calc.
Stereocentres
0calc.
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

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H302Harmful if swallowed.
  • H315Causes skin irritation.
  • H318Causes serious eye damage.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (23)
  • 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.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • 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.
  • P391Collect spillage.
  • 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

Solvent Red 49 suppliers

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

All 19 suppliers
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Where suppliers are based

19 suppliers in 4 countries

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Solvent Red 49 price

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Uses and applications

What the substance is used for, by industry and function

Industries and functions

Functional uses

  • Dye

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active 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 Solvent Red 49 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 49 is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Solvent Red 49, based on the data on this page

What is Solvent Red 49?

Solvent Red 49 is a chemical substance with the molecular formula C28H30N2O3 and a molar mass of 442.56 g/mol. Its CAS registry number is 509-34-2. The IUPAC name is 3',6'-bis(diethylamino)spiro[2-benzofuran-3,9'-xanthene]-1-one.

What is the CAS number of Solvent Red 49?

The CAS registry number of Solvent Red 49 is 509-34-2.

What is the molecular formula and weight of Solvent Red 49?

The molecular formula of Solvent Red 49 is C28H30N2O3 and its molar mass is 442.56 g/mol.

What is Solvent Red 49 used for?

Known uses and roles of Solvent Red 49 include textile dyes in textiles and leather and dye.

Is Solvent Red 49 hazardous?

Solvent Red 49 carries the GHS signal word "Danger". Main hazards: harmful if swallowed, causes skin irritation, causes serious eye damage. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Solvent Red 49?

Solvent Red 49 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 49?

CompoundList lists 19 suppliers of Solvent Red 49 in India, China, United Kingdom and Germany. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Solvent Red 49 in India?

11 suppliers in India list Solvent Red 49 on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Solvent Red 49?

Suppliers quote Solvent Red 49 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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