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Aromatic building blocks

Para red

Also known as 1-(4-Nitrophenylazo)-2-naphthol, Lutetia Red N, 1-((4-Nitrophenyl)diazenyl)naphthalen-2-ol

CAS 6410-10-2Formula C16H11N3O3Molar mass 293.28 g/molEC 229-093-8
2 suppliers listed
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Para red chemical structure, C16H11N3O3, CAS 6410-10-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
6410-10-2
Formula
C16H11N3O3
Molar mass
293.28 g/mol
EC number
229-093-8
HS code
292700
Category
Aromatic building blocks

What is Para red?

Plain description, key identifiers and synonyms

Para red is a chemical substance with the molecular formula C16H11N3O3 and a molar mass of 293.28 g/mol. Its CAS registry number is 6410-10-2. The IUPAC name is 1-[(4-nitrophenyl)diazenyl]naphthalen-2-ol.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1-[(4-nitrophenyl)diazenyl]naphthalen-2-ol
CAS number
6410-10-2 CAS number cross-checkedOther or deprecated CAS: 99366-04-8
EC number
229-093-8
Molecular formula
C16H11N3O3
UNII
D54Q24K2EI
MDL number
MFCD00003908
InChIKey
WOTPFVNWMLFMFW-UHFFFAOYSA-N
InChI
InChI=1S/C16H11N3O3/c20-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)19(21)22/h1-10,20H
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C=CC(=C2N=NC3=CC=C(C=C3)[N+](=O)[O-])O

Synonyms

  • 1-(4-Nitrophenylazo)-2-naphthol
  • Lutetia Red N
  • 1-((4-Nitrophenyl)diazenyl)naphthalen-2-ol
  • Para Toner
  • Para Red Toner
  • p-Nitraniline red
  • Carnelio Para Red BS
  • Para Toner D
  • Para Nitraniline Red
  • Federal Red
  • Para Red Toner RPT-52
  • Label Red
  • Carnelio Para Red YS
  • Eljon Para Red
  • Para Red Light
  • Para Toner Red
  • Lutetia Red B
  • Para Red Dark
  • Siloton Red B
  • Siloton Red G
  • Para Toner B
  • Lake Brown BRA
  • Tolyl Red D
  • Tolyl Red M
  • Conc. Para Red
Show all 39 synonyms
  • Lacal Red GN
  • Tolyl Red LL
  • Isol Para Red B
  • Lake Red PN
  • Para Red BS
  • Para Red YS
  • Para Toner Dark 5065
  • Lake Red 2R
  • Kromon Para Red BS
  • Kromon Para Red YS
  • Monolite Fast Red B
  • Recolite Para Red B
  • Recolite Para Red G
  • Conc. Para Red YS

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
293.28 g/molcalc.
Exact mass
293.08 Dacalc.
LogP (octanol/water)
4.87calc.
Topological polar surface area
88.09 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
3calc.
Heavy atoms
22calc.
Rings
3calc.
Aromatic rings
3calc.
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, c1ccc(N=Nc2cccc3ccccc23)cc1

c1ccc(N=Nc2cccc3ccccc23)cc1

3 rings, 18 atoms, the Diazene, naphthalenylphenyl- ring system.

1,098 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.

Para red suppliers

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

All 2 suppliers
  • AmXpress
    Hong KongUnclaimed profile
    Para RedGrade, purity and minimum order on request
    Price on request
    View
  • KHATAU VALABHDAS and CO.
    India, Mumbai ManufacturerUnclaimed profile
    Para RedGrade, purity and minimum order on request
    Price on request
    View

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

2 suppliers in 2 countries

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Para 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

Functional uses

  • Pigment

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 Para red is traded under.

HS 2927.00Indicative HS code

Diazo-, azo- or azoxy compounds

World exports in 2024
$571M
+6.1% vs 2023, imports $525M
2019 to 2024
Top exporters
  1. China47.0%
  2. Indonesia13.1%
  3. Japan9.3%
Top importers
  1. United States10.2%
  2. India * partner reported9.1%
  3. South Korea9.1%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Para red?

Para red is a chemical substance with the molecular formula C16H11N3O3 and a molar mass of 293.28 g/mol. Its CAS registry number is 6410-10-2. The IUPAC name is 1-[(4-nitrophenyl)diazenyl]naphthalen-2-ol.

What is the CAS number of Para red?

The CAS registry number of Para red is 6410-10-2. Other or deprecated CAS numbers: 99366-04-8.

What is the molecular formula and weight of Para red?

The molecular formula of Para red is C16H11N3O3 and its molar mass is 293.28 g/mol.

What is Para red used for?

Known uses and roles of Para red include building blocks in research and laboratory, screening compounds in research and laboratory and pigment.

Is Para red hazardous?

No GHS hazard classification for Para 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 Para red?

Para red is usually classified under HS code 292700 (Diazo-, azo- or azoxy-compounds). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Para red?

CompoundList lists 2 suppliers of Para red in Hong Kong and India. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Para red in India?

1 supplier in India list Para 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 Para red?

Suppliers quote Para 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 Para 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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