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Heterocyclic building blocks

Phenazopyridine

Also known as 3-(Phenylazo)-2,6-pyridinediamine, Gastracid, Fenazopiridina

CAS 94-78-0Formula C11H11N5Molar mass 213.24 g/molEC 202-363-2
11 suppliers listed
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Phenazopyridine chemical structure, C11H11N5, CAS 94-78-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
94-78-0
Formula
C11H11N5
Molar mass
213.24 g/mol
EC number
202-363-2
HS code
293339
Category
Heterocyclic building blocks

What is Phenazopyridine?

Plain description, key identifiers and synonyms

Phenazopyridine is a diaminopyridine that is 2,6-diaminopyridine substituted at position 3 by a phenylazo group. A local anesthetic that has topical analgesic effect on mucosa lining of the urinary tract. Its use is limited by problems with toxicity (primarily blood disorders) and potential carcinogenicity. It has a role as an anticoronaviral agent, a non-narcotic analgesic, a local anaesthetic and a carcinogenic agent. It is a monoazo compound and a diaminopyridine. It is a conjugate base of a phenazopyridine(1+).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3-phenyldiazenylpyridine-2,6-diamine
CAS number
94-78-0 CAS number cross-checked
EC number
202-363-2
Molecular formula
C11H11N5
UNII
K2J09EMJ52
MDL number
MFCD00091843
InChIKey
QPFYXYFORQJZEC-UHFFFAOYSA-N
InChI
InChI=1S/C11H11N5/c12-10-7-6-9(11(13)14-10)16-15-8-4-2-1-3-5-8/h1-7H,(H4,12,13,14)
SMILES (canonical and isomeric)
C1=CC=C(C=C1)N=NC2=C(N=C(C=C2)N)N

Synonyms

  • 3-(Phenylazo)-2,6-pyridinediamine
  • Gastracid
  • Fenazopiridina
  • Pyrazofen
  • 2,6-Pyridinediamine, 3-(phenylazo)-
  • 2,6-Diamino-3-phenylazopyridine
  • Gastrotest
  • Pyridiate
  • 2,6-Diamino-3-(phenylazo)pyridine
  • Pyridacil
  • Phenazopyridinum
  • 3-phenyldiazenylpyridine-2,6-diamine
  • 3-(2-phenyldiazen-1-yl)pyridine-2,6-diamine
  • Uridinal
  • 3-(phenyldiazenyl)pyridine-2,6-diamine
  • Pyridine, 2,6-diamino-3-(phenylazo)-
  • 3-[(E)-phenyldiazenyl]pyridine-2,6-diamine hydrochloride
  • Baridium
  • Urogesic
  • Viridium
  • Gastracid, Gastrotest, NSC 145895
  • Pirid (Salt/Mix)
  • Sedural (Salt/Mix)
  • Urodine (Salt/Mix)
  • Diridone (Salt/Mix)
Show all 39 synonyms
  • Nefrecil (Salt/Mix)
  • Suladyne (Salt/Mix)
  • Uridinal (Salt/Mix)
  • Di-Azo (Salt/Mix)
  • Mallofeen (Salt/Mix)
  • Phenazopyridine (INN)
  • Pyridacil (Salt/Mix)
  • Eridium
  • Geridium
  • Mallophene (Salt/Mix)
  • Pyrazodine (Salt/Mix)
  • Phenazodine (Salt/Mix)
  • NC 150 (Salt/Mix)
  • W 1655 (Salt/Mix)

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
213.24 g/molcalc.
Exact mass
213.1014 Dacalc.
LogP (octanol/water)
2.66calc.
Topological polar surface area
89.65 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
2calc.
Heavy atoms
16calc.
Rings
2calc.
Aromatic rings
2calc.
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=Nc2cccnc2)cc1

c1ccc(N=Nc2cccnc2)cc1

2 rings, 14 atoms, the Pyridine, 3-(phenylazo)- ring system.

59 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.

Phenazopyridine 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 5 countries

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Phenazopyridine 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

Use classes: Pharmaceuticals.

Roles

  • aetiopathogenetic role
  • anaesthetic
  • analgesic
  • anticoronaviral agent
  • antimicrobial agent
  • antiviral agent
  • carcinogenic agent
  • local anaesthetic
  • non-narcotic analgesic
  • pharmaceutical

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 Phenazopyridine is traded under.

HS 2933.39Indicative HS code

Heterocyclic compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure…

World exports in 2024
$9.16B
−17.9% vs 2023, imports $10.6B
2019 to 2024
Top exporters
  1. China21.5%
  2. India * partner reported12.3%
  3. Ireland11.6%
Top importers
  1. Germany14.2%
  2. United States12.8%
  3. Brazil10.1%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Phenazopyridine, based on the data on this page

What is Phenazopyridine?

Phenazopyridine is a diaminopyridine that is 2,6-diaminopyridine substituted at position 3 by a phenylazo group. A local anesthetic that has topical analgesic effect on mucosa lining of the urinary tract. Its use is limited by problems with toxicity (primarily blood disorders) and potential carcinogenicity.

What is the CAS number of Phenazopyridine?

The CAS registry number of Phenazopyridine is 94-78-0.

What is the molecular formula and weight of Phenazopyridine?

The molecular formula of Phenazopyridine is C11H11N5 and its molar mass is 213.24 g/mol.

What is Phenazopyridine used for?

Use classes: Pharmaceuticals.

Is Phenazopyridine hazardous?

No GHS hazard classification for Phenazopyridine 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 Phenazopyridine?

Phenazopyridine is usually classified under HS code 293339 (Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Phenazopyridine?

CompoundList lists 11 suppliers of Phenazopyridine in India, China, Hong Kong, Netherlands and 1 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Phenazopyridine in India?

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

What is the price of Phenazopyridine?

Suppliers quote Phenazopyridine 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 Phenazopyridine

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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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