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Fluorescent dyes and stains

Nile red

Also known as 9-(diethylamino)-5H-benzo[a]phenoxazin-5-one, Nile Blue A Oxazone, 9-(Diethylamino)-5H-benzo(a)phenoxazin-5-one

CAS 7385-67-3Formula C20H18N2O2Molar mass 318.38 g/molEC 230-966-0
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Nile red chemical structure, C20H18N2O2, CAS 7385-67-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
7385-67-3
Formula
C20H18N2O2
Molar mass
318.38 g/mol
EC number
230-966-0
HS code
293499
Category
Fluorescent dyes and stains

What is Nile red?

Plain description, key identifiers and synonyms

Nile red is an organic heterotetracyclic compound that is 5H-benzo[a]phenoxazin-5-one substituted at position 9 by a diethylamino group. It has a role as a fluorochrome and a histological dye. It is an aromatic amine, an organic heterotetracyclic compound, a cyclic ketone and a tertiary amino compound.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
9-(diethylamino)benzo[a]phenoxazin-5-one
CAS number
7385-67-3 CAS number cross-checked
EC number
230-966-0
Molecular formula
C20H18N2O2
UNII
P476F1L81G
MDL number
MFCD00011639
InChIKey
VOFUROIFQGPCGE-UHFFFAOYSA-N
InChI
InChI=1S/C20H18N2O2/c1-3-22(4-2)13-9-10-16-18(11-13)24-19-12-17(23)14-7-5-6-8-15(14)20(19)21-16/h5-12H,3-4H2,1-2H3
SMILES (canonical and isomeric)
CCN(CC)C1=CC2=C(C=C1)N=C3C4=CC=CC=C4C(=O)C=C3O2

Synonyms

  • 9-(diethylamino)-5H-benzo[a]phenoxazin-5-one
  • Nile Blue A Oxazone
  • 9-(Diethylamino)-5H-benzo(a)phenoxazin-5-one
  • 5H-Benzo[a]phenoxazin-5-one, 9-(diethylamino)-
  • 5H-Benzo(a)phenoxazin-5-one, 9-(diethylamino)-
  • 9-diethylamino-5h-benzo(a)phenoxazine-5-one
  • 9-(diethylamino)benzo[a]phenoxazin-5-one
  • Nile Blue A oxazone, Phenoxazone 9
  • 8-(diethylamino)-12H-10-oxa-5-azatetraphen-12-one
  • 9-(diethylamino)benzo[a]phenoxazin-5(5H)-one
  • 5H-Benzo[a]phenoxazin-5-one,9-(diethylamino)-
  • 9-diethylamino-5H-benzo-alpha-phenoxazine-5-one
  • Nilered
  • 9-(Diethylamino)benzo(a)phenoxazin-5(5H)-one
  • nile-red
  • Nile Red, for microscopy
  • Nile Red, Technical grade
  • Cl-870
  • 9-(Diethylamino)-5H-benzo(a)pheno
  • 9-diethylaminobenzo[a]phenoxazin-5-one
  • 9-(diethylamino)-5-benzo[a]phenoxazinone
  • Nile Red, BioReagent, suitable for fluorescence, >=98.0% (HPLC)
  • N,N'-Dicyclohexylcarbodiimide, ChemDose(TM) tablets, Loading: 0.15mmol per tablet

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
318.38 g/molcalc.
Exact mass
318.1368 Dacalc.
LogP (octanol/water)
4.29calc.
Topological polar surface area
46.34 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
3calc.
Heavy atoms
24calc.
Rings
4calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.2calc.
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=c1cc2oc3ccccc3nc-2c2ccccc12

O=c1cc2oc3ccccc3nc-2c2ccccc12

4 rings, 19 atoms, the 5H-Benzo(a)phenoxazin-5-one ring system.

57 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.

Nile red suppliers

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

All 21 suppliers
21 of 21 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

21 suppliers in 8 countries

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Nile red 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

Pharmacological actions

  • Fluorescent Dyes

Roles

  • dye
  • fluorescent dye
  • fluorochrome
  • histological 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 Nile red is traded under.

HS 2934.99Indicative HS code

Nucleic acids and their salts, other heterocyclic compounds, not elsewhere classified in heading 2934

World exports in 2024
$26.7B
+15.0% vs 2023, imports $26.3B
2019 to 2024
Top exporters
  1. Ireland26.3%
  2. China15.7%
  3. Singapore10.3%
Top importers
  1. United States24.5%
  2. Germany23.1%
  3. Japan4.5%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

Quick answers about Nile red, based on the data on this page

What is Nile red?

Nile red is an organic heterotetracyclic compound that is 5H-benzo[a]phenoxazin-5-one substituted at position 9 by a diethylamino group. It has a role as a fluorochrome and a histological dye. It is an aromatic amine, an organic heterotetracyclic compound, a cyclic ketone and a tertiary amino compound.

What is the CAS number of Nile red?

The CAS registry number of Nile red is 7385-67-3.

What is the molecular formula and weight of Nile red?

The molecular formula of Nile red is C20H18N2O2 and its molar mass is 318.38 g/mol.

What is Nile red used for?

Known uses and roles of Nile red include indicators and stains in research and laboratory, fluorescent probes in research and laboratory, dye, fluorescent dye, fluorochrome and 2 more.

Is Nile red hazardous?

No GHS hazard classification for Nile red 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 Nile red?

Nile red is usually classified under HS code 293499 (Nucleic acids and their salts, whether or not chemically defined, other heterocyclic…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Nile red?

CompoundList lists 21 suppliers of Nile red in China, United States, India, United Kingdom and 4 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Nile red in India?

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

What is the price of Nile red?

Suppliers quote Nile red 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 Nile red

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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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