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Impurities and reference standards

Azure C

Also known as Monomethylthionine, Methylene Azure C, azurec

CAS 531-57-7Formula C13H12ClN3SMolar mass 277.78 g/molEC 208-512-8
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Azure C chemical structure, C13H12ClN3S, CAS 531-57-7
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
531-57-7
Formula
C13H12ClN3S
Molar mass
277.78 g/mol
EC number
208-512-8
HS code
320413
Category
Impurities and reference standards

What is Azure C?

Plain description, key identifiers and synonyms

Azure C is an organic chloride salt having 3-amino-7-(methylamino)phenothiazin-5-ium as the counterion. It has a role as a fluorochrome and a histological dye. It contains a 3-amino-7-(methylamino)phenothiazin-5-ium.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
7-methyliminophenothiazin-10-ium-3-amine chloride
CAS number
531-57-7 CAS number cross-checked
EC number
208-512-8
Molecular formula
C13H12ClN3S
UNII
JGC8OHD9Z9
MDL number
MFCD00067677
InChIKey
DDGMDTGNGDOUPX-UHFFFAOYSA-N
InChI
InChI=1S/C13H11N3S.ClH/c1-15-9-3-5-11-13(7-9)17-12-6-8(14)2-4-10(12)16-11;/h2-7H,14H2,1H3;1H
SMILES (canonical and isomeric)
CN=C1C=CC2=[NH+]C3=C(C=C(C=C3)N)SC2=C1.[Cl-]

Synonyms

  • Monomethylthionine
  • Methylene Azure C
  • azurec
  • Monomethylthionine chloride
  • 3-amino-7-(methylamino)phenothiazin-5-ium chloride
  • 7-methyliminophenothiazin-10-ium-3-amine, chloride
  • AZUR C
  • 3-Amino-7-methylaminophenothiazin-5-ium chloride
  • Monomethyldiaminodiphenazothionium chloride
  • 3-Imino-7-(methylamino)-3H-phenothiazine hydrochloride
  • C.I. 52002
  • Azure C (Technical Grade)
  • Azure C (VAN)
  • (3E)-7-amino-3-(methylimino)-3H-phenothiazin-10-ium chloride
  • C13H12ClN3S
  • Azzurro C
  • N- methylthionine
  • Azure c macneal
  • CI 52002
  • Azure c, french
  • Phenothiazin-5-ium, 3-amino-7-methylamino-, chloride
  • Methylene blue impurity c
  • 3-Amino-7-(methylamino)phenothiazin-5-ium chloride (1:1)
  • Azure c, biological stain
  • Azure c, for microbiology
Show all 33 synonyms
  • CI 522
  • Azure C Solution in Water, 100ug/mL
  • N7-methylphenothiazin-5-ium-3,7-diamine
  • 3-Amino-7-methylaminophenazathonium chloride
  • Methylene blue /Methylthioninium Chloride Impurity 24
  • Phenothiazin-5-ium, 3-amino-7-(methylamino)-, chloride
  • Methylthioninium chloride hydrate EP Impurity C, <br>Azure C
  • Methylthioninium chloride hydrate impurity c

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
277.78 g/molcalc.
Exact mass
277.044 Dacalc.
LogP (octanol/water)
-1.06calc.
Topological polar surface area
52.52 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
0calc.
Heavy atoms
18calc.
Rings
3calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0.08calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
2calc.
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, N=c1ccc2nc3ccccc3sc-2c1

N=c1ccc2nc3ccccc3sc-2c1

3 rings, 15 atoms.

21 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.

Azure C suppliers

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All 4 suppliers
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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

4 suppliers in 2 countries

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Azure C 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

Roles

  • dye
  • fluorescent dye
  • fluorochrome
  • histological dye

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Azure C is traded under.

HS 3204.13Indicative HS code

Basic dyes and preparations based thereon

World exports in 2024
$209M
−2.6% vs 2023, imports $224M
2019 to 2024
Top exporters
  1. India * partner reported27.9%
  2. China21.8%
  3. Spain6.6%
Top importers
  1. United States11.2%
  2. China7.9%
  3. Germany7.4%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Azure C, based on the data on this page

What is Azure C?

Azure C is an organic chloride salt having 3-amino-7-(methylamino)phenothiazin-5-ium as the counterion. It has a role as a fluorochrome and a histological dye. It contains a 3-amino-7-(methylamino)phenothiazin-5-ium.

What is the CAS number of Azure C?

The CAS registry number of Azure C is 531-57-7.

What is the molecular formula and weight of Azure C?

The molecular formula of Azure C is C13H12ClN3S and its molar mass is 277.78 g/mol.

What is Azure C used for?

Known uses and roles of Azure C include textile dyes in textiles and leather, indicators and stains in research and laboratory, dye, fluorescent dye, fluorochrome and 1 more.

Is Azure C hazardous?

No GHS hazard classification for Azure C 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 Azure C?

Azure C is usually classified under HS code 320413 (Basic dyes and preparations based thereon). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Azure C?

CompoundList lists 4 suppliers of Azure C in India and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Azure C in India?

3 suppliers in India list Azure C on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Azure C?

Suppliers quote Azure C 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 Azure C

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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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