In short
Azuril is a cyclohexene nitrile with a citrus, ozone and clean-linen odour. LANXESS sells it as Kalama Azuril, a mixture of structural isomers.
What Azuril smells like
LANXESS, which sells it as Kalama Azuril, describes a distinctive citrus-ozone-linen odour and a mixture of structural isomers. The Good Scents Company lists ozone, fresh, citrus, clean linen and marine. A patent describes Azuril as having a citrus-like odour.
- Leading note
- Citrus
- Clear facets
- Ozonic, clean linen
- Faint facets
- Marine
- Character
- Clean, fresh
What makes Azuril distinctive
A nitrile that smells of clean washing as much as of citrus.
How Azuril is used
Used for stable citrus-ozonic freshness, especially in functional products.
Typical role: modifier (used in small amounts to change the character of a blend).
How Azuril differs from similar materials
- Ultrazur
- Ultrazur is a whole marine base, its sea air over ambery tropical woods; Azuril is a single nitrile, citrus and clean linen first, with ozone as a facet.
Each difference compares the published descriptions of the two materials. Smell varies with grade, supplier and dilution; compare them side by side on blotters before substituting one for another.
Formulation considerations
A mixture of structural isomers (LANXESS also lists CAS 21690-43-7); store sealed, as it oxidises.
Identity and classification
- Type
- Aroma chemical
- Origin
- Synthetic
- Odour family
- Citrus / Aquatic
- Note position
- Top to heart note
- Physical form at room temperature
- Liquid
- Also known as
- 3-(4-Methylpent-3-enyl)cyclohex-3-ene-1-carbonitrile
- CAS number
- 68084-04-8
- Molecular formula
- C13H19N
- Molecular weight
- 189.3 g/mol
- IUPAC name
- 3-(4-methylpent-3-enyl)cyclohex-3-ene-1-carbonitrile
The CAS number, formula and molecular weight are taken from PubChem compound 107099, whose own record lists this CAS number; checked 24 October 2026.
Safety and compliance
Hazard classification of the neat substance, as PubChem summarises it, read 26 October 2026. Companies notifying the ECHA C&L Inventory classify it (151 reports): H411 toxic to aquatic life with long lasting effects (24.5% of reports). 114 of the reports find it does not meet the hazard criteria. Unless it is harmonised, this is the notifiers' own classification, not a binding one.
This page is general information, not a safety assessment or a specification. Confirm identity, composition, IFRA status and allergen content from your supplier's documents for the lot you hold.
Materials it works with
-
Dihydromyrcenol
Aroma chemical · Citrus / Aromatic — citrus, lime, fresh, clean
-
Citronellyl Nitrile
Aroma chemical · Citrus / Metallic — lemon, metallic, fresh, waxy
-
Floralozone
Aroma chemical · Aquatic / Floral — ozonic, marine, floral, airy
Used in formulas and accords
Used in 5 published formulas
Azuril is an ingredient in 4 perfume formulas and 1 accord in the Formula & Accord Library.
Community formulas
RUŌOD House Originals
Original compositions by RUŌOD House.
Further reading
Questions about Azuril
Is Azuril natural or synthetic?
Azuril is synthetic — it is made by chemical synthesis.
What is the CAS number of Azuril?
68084-04-8. It was checked against PubChem on 24 October 2026.
Which published formulas use Azuril?
Azuril is used in 5 published formulas in the RUŌOD Lab Formula & Accord Library, including Black Pepper Sail, Ginger Lightning and Rain on Linen. Each is listed with a link under "Used in formulas and accords" on this page.
Sources
- PubChem — compound 107099, checked 24 October 2026.
- PubChem — GHS classification (the ECHA C&L Inventory notifications and any harmonised EU entry), read 26 October 2026.
- LANXESS — Kalama Azuril — manufacturer's description.
- The Good Scents Company — Azuril — odour database.
- Olfactory profile: the RUŌOD Lab team's synthesis of the published descriptions above, reviewed 26 October 2026. Evidence: more than one published description. Classification and the short description: revision 1. Descriptions of odour are judgement, not measurement.