C22H16N4O
352.4 g/mol
Dye & PigmentDanger
Sudan III
CAS85-86-9EC201-638-4
Category
Dye & Pigment
Compound Class
Aromatic
Primary Use
Biological stain and histological dye
Sudan III is a fat-soluble bis(azo) dye used primarily in histology to demonstrate triglycerides in frozen tissue sections, and it may also stain certain protein-bound lipids in paraffin sections. It has been noted as a carcinogenic agent and is also employed as a fluorochrome and histological dye in laboratory settings.
Biological stain for demonstrating triglycerides in frozen sectionsStaining protein-bound lipids in paraffin sectionsUse as a histological dye and fluorochrome
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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Related Compounds
StrongStructure SimilarSimilarity 0.96
Solvent yellow 14
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ReferenceSame Category
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dye intermediate
ReferenceSame Category
2,7-Naphthalenedisulfonic acid, 4-amino-3-[2-[4-[[4-[2-(2-amino-4-hydroxyphenyl)diazenyl]phenyl]amino]-3-sulfophenyl]diazenyl]-5-hydroxy-6-(2-phenyldiazenyl)-, sodium salt (1:3)
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direct dye for textiles
ReferenceSame Category
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acid dye for textile coloring
Referencesame scaffold
Acid Red 151
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synthetic acid dye
Referencesame scaffold
Oil Red O
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Histological dye for triglycerides
Referencesame scaffold
Acid Red 73, disodium salt
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Acid dye for textiles and histology
Safety Reference
Danger
H315Causes skin irritation
H318Causes serious eye damage
H317May cause an allergic skin reaction
H335May cause respiratory irritation
H341Suspected of causing genetic defects
H412Harmful to aquatic life with long lasting effects
H351Suspected of causing cancer
Customs Tariff Classification
The international HS code for Sudan III (CAS 85-86-9) is 3204.19.
HS code (international, 6-digit)
3204.19
EU CN code (8-digit)
3204 19 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
1-[(4-phenyldiazenylphenyl)diazenyl]naphthalen-2-ol
InChIKey
FHNINJWBTRXEBC-UHFFFAOYSA-N
SMILES
C1=CC=C(C=C1)N=NC2=CC=C(C=C2)N=NC3=C(C=CC4=CC=CC=C43)O
Synonyms (82)
- 111440 Red
- A204 TUDOR PHLOX
- C.I. Solvent Red 23
- Cerasin Red
- Cerasinrot
- Cerotinscharlach R
- Cerven rozpoustedlova 23
- D & C RED NO.17 K7007
- D & C Red #17
- D & C Red no. 17
- D and C Red No. 17
- D&C RED DYE NO 17
- FD and C Red No. 17
- Fat Red (bluish)
- Fat Red HRR
- Fat Red R
- Fat Red RS
- Fat Red, Bluish (VAN)
- Fat Scarlet LB
- Fat Soluble Red ZH
- Fettponceau G
- Fettrot
- Fettscharlach
- Fettscharlach LB
- Grasal Brilliant Red G
- Grasan Brilliant Red G
- Japan Red 225
- Motirot 2R
- Organol Red BS
- Ponceau, OLG
- Ponceau, insoluble, OLG
- Pyronalrot B
- Red No. 225
- Red ZH
- Rot C
- Rot G
- Rouge cerasine
- Schultz No. 31
- Silotras Scarlet TB
- Solvent red 23
- Somalia Red III
- Soudan III
- Stearix Scarlet
- Sudan
- Sudan 3
- Sudan G III
- Sudan III
- Sudan III (G)
- Sudan III, C.I. 26100
- Sudan IIISolvent Red 23
- Sudan P III
- Sudan Red BK
- Sudan Red III
- Sudanrot
- Tetrazobenzene-beta-naphthol
- Toney Red
- Tony Red
- red 17
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