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Nitriles, nitro and azo compounds

Hydroxynaphthol blue

Also known as Hydroxy naphthol blue, Hydroxynapthol Blue (Technical Grade), trisodium, 3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2,7-disulfonate

CAS 63451-35-4Formula C20H11N2Na3O11S3Molar mass 620.48 g/molEC 264-197-7
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Hydroxynaphthol blue chemical structure, C20H11N2Na3O11S3, CAS 63451-35-4
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
63451-35-4
Formula
C20H11N2Na3O11S3
Molar mass
620.48 g/mol
EC number
264-197-7
HS code
292700
Category
Nitriles, nitro and azo compounds

What is Hydroxynaphthol blue?

Plain description, key identifiers and synonyms

Hydroxynaphthol blue is a chemical substance with the molecular formula C20H11N2Na3O11S3 and a molar mass of 620.48 g/mol. Its CAS registry number is 63451-35-4. The IUPAC name is trisodium, 3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2,7-disulfonate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
trisodium, 3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2,7-disulfonate
CAS number
63451-35-4 CAS number cross-checkedOther or deprecated CAS: 1260907-08-1
EC number
264-197-7
Molecular formula
C20H11N2Na3O11S3
UNII
VG5SKF7S6C
MDL number
MFCD00036393
InChIKey
AUIINJJXRXMPGT-UHFFFAOYSA-K
InChI
InChI=1S/C20H14N2O11S3.3Na/c23-15-9-16(35(28,29)30)13-3-1-2-4-14(13)18(15)21-22-19-12-6-5-11(34(25,26)27)7-10(12)8-17(20(19)24)36(31,32)33;;;/h1-9,23-24H,(H,25,26,27)(H,28,29,30)(H,31,32,33);;;/q;3*+1/p-3
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C(=CC(=C2N=NC3=C4C=CC(=CC4=CC(=C3O)S(=O)(=O)[O-])S(=O)(=O)[O-])O)S(=O)(=O)[O-].[Na+].[Na+].[Na+]

Synonyms

  • Hydroxy naphthol blue
  • Hydroxynapthol Blue (Technical Grade)
  • trisodium, 3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2,7-disulfonate
  • Sodium 3-hydroxy-4-((2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl)naphthalene-2,7-disulfonate
  • 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-((2-hydroxy-4-sulfo-1-naphthalenyl)azo)-, trisodium salt
  • 2,7-Naphthalenedisulfonic acid,3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]-, trisodium salt
  • Trisodium 3-hydroxy-4-((2-hydroxy-4-sulphonato-1-naphthyl)azo)naphthalene-2,7-disulphonate
  • 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]-, trisodium salt
  • 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-(2-(2-hydroxy-4-sulfo-1-naphthalenyl)diazenyl)-, sodium salt (1:3)
  • 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[2-(2-hydroxy-4-sulfo-1-naphthalenyl)diazenyl]-, sodium salt (1:3)
  • 1,1'-Azonaphthalene, 2,2'-dihydroxy-3,3',6-trisulfonic acid-, trisodium salt
  • 3-Hydroxy-4-[(2-hydroxy-4-sulfo-1-naphthalenyl)azo]-2,7-naphthalenedisulfonic Acid Trisodium Salt
  • Sodium (E)-3-Hydroxy-4-[(2-hydroxy-4-sulfonato-1-naphthyl)diazenyl]naphthalene-2,7-disulfonate
  • Trisodium 3-hydroxy-4-((2Z)-2-(2-oxo-4-sulfonatonaphthalen-1-ylidene)hydrazinyl)naphthalene-2,7-disulfonate
  • Trisodium 3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2,7-disulfonate

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
620.48 g/molcalc.
Exact mass
619.9218 Dacalc.
LogP (octanol/water)
-6.46calc.
Topological polar surface area
236.8 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
13calc.
Rotatable bonds
5calc.
Heavy atoms
39calc.
Rings
4calc.
Aromatic rings
4calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
4calc.
Lipinski rule of five
Fails (2 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, c1ccc2c(N=Nc3cccc4ccccc34)cccc2c1

c1ccc2c(N=Nc3cccc4ccccc34)cccc2c1

4 rings, 22 atoms, the 1,2-Di-1-naphthalenyldiazene ring system.

184 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.

Hydroxynaphthol blue suppliers

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

All 11 suppliers
11 of 11 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

11 suppliers in 3 countries

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Hydroxynaphthol blue price

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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

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Hydroxynaphthol blue 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 Hydroxynaphthol blue is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Hydroxynaphthol blue, based on the data on this page

What is Hydroxynaphthol blue?

Hydroxynaphthol blue is a chemical substance with the molecular formula C20H11N2Na3O11S3 and a molar mass of 620.48 g/mol. Its CAS registry number is 63451-35-4. The IUPAC name is trisodium, 3-hydroxy-4-[(2-hydroxy-4-sulfonatonaphthalen-1-yl)diazenyl]naphthalene-2,7-disulfonate.

What is the CAS number of Hydroxynaphthol blue?

The CAS registry number of Hydroxynaphthol blue is 63451-35-4. Other or deprecated CAS numbers: 1260907-08-1.

What is the molecular formula and weight of Hydroxynaphthol blue?

The molecular formula of Hydroxynaphthol blue is C20H11N2Na3O11S3 and its molar mass is 620.48 g/mol.

Is Hydroxynaphthol blue hazardous?

No GHS hazard classification for Hydroxynaphthol blue 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 Hydroxynaphthol blue?

Hydroxynaphthol blue 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 Hydroxynaphthol blue?

CompoundList lists 11 suppliers of Hydroxynaphthol blue in India, United States and Iran. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Hydroxynaphthol blue in India?

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

What is the price of Hydroxynaphthol blue?

Suppliers quote Hydroxynaphthol blue 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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