Lyral

What Lyral smells like

The Good Scents Company quotes IFF's description of Lyral as a soft, delicate floral, lily, cyclamen and lilac note reminiscent of hydroxycitronellal, with strong tenacity; another listing gives floral, muguet, aldehydic and woody. A patent cites it as an IFF ingredient valued for its lily-of-the-valley note. Its EU status is taken from Regulation (EU) 2017/1410 as recorded in this site's regulatory notes.

Leading note

Muguet

Clear facets

Lily

Supporting facets

Cyclamen, lilac

Character

Soft, tenacious

• muguet
• lily
• cyclamen
• floral
• soft

What makes Lyral distinctive

The classic soft muguet aldehyde, now historical in EU cosmetics.

How Lyral is used

Formerly a backbone of muguet and white-floral accords; historic formulas name it, current EU cosmetics may not contain it.

Typical role: backbone (used in large proportions as a structural material of an accord).

How Lyral differs from similar materials

Lilial

Lilial, the other muguet aldehyde now prohibited in EU cosmetics, is more radiant, green and aldehydic-clean.

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

Prohibited in cosmetic products in the European Union: Annex II, entry 1380 (Regulation (EU) 2017/1410), not to be placed on the market from 23 August 2019 or made available from 23 August 2021. IFRA restricts it (Amendment 49). It is a known skin sensitiser.

Identity and classification

Type

Aroma chemical

Origin

Synthetic

Odour family

Floral

Note position

Heart note

Physical form at room temperature

Viscous liquid

Also known as

HICC, Hydroxyisohexyl 3-cyclohexene carboxaldehyde

CAS number

31906-04-4

Molecular formula

C13H22O2

Molecular weight

210.31 g/mol

IUPAC name

4-(4-hydroxy-4-methylpentyl)cyclohex-3-ene-1-carbaldehyde

The CAS number, formula and molecular weight are taken from PubChem compound 91604, whose own record lists this CAS number; checked 24 October 2026.

Safety and compliance

The IFRA Standards Library lists a Standard covering Lyral:

• "3 and 4-(4-Hydroxy-4-methylpentyl)-3-cyclohexene-1-carboxaldehyde (HMPCC)" — Restriction, 49th Amendment, published 2020-01

Limits differ by product category and are set out in the Standard itself; this page does not reproduce them. The list above reflects the library as read on 19 October 2026.

Lyral is one of the 26 fragrance allergens listed individually in Annex III of the EU Cosmetics Regulation (label name: Hydroxyisohexyl 3-cyclohexene carboxaldehyde), which must be named on cosmetic labels above 0.001% in leave-on and 0.01% in rinse-off products. Regulation (EU) 2023/1545 extended the list; see the fragrance allergens list.

Hazard classification of the neat substance, as PubChem summarises it, read 26 October 2026. It has a harmonised EU classification (Regulation (EC) No 1272/2008, Annex VI): H317 may cause an allergic skin reaction. Companies notifying the ECHA C&L Inventory classify it (1,981 reports): H317 may cause an allergic skin reaction (97.9% of reports); H412 harmful to aquatic life with long lasting effects (15.1% of reports). 41 of the reports find it does not meet the hazard criteria. A skin sensitiser classification concerns handling the neat material and the dose in a finished product; the IFRA Standards, where they apply, set the limits. 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

• Hydroxycitronellal

  Aroma chemical · Floral / Green — muguet, floral, soft, sweet

• Lilyflore

  Aroma chemical · Floral / Green — muguet, floral, fresh, soft

• Cyclamen Aldehyde

  Aroma chemical · Floral / Green — floral, green, watery, fresh

Used in formulas and accords

Not currently used in any published formula.

The Formula & Accord Library lists Lyral here as soon as a published formula, accord or base uses it.

Further reading

• Perfume Materials by Odor Family: A Formulator's Palette Map

  Which materials build each odor family — citrus, floral, woody, amber, musk and more — their usual roles, what to watch for, and links to each in depth.

Questions about Lyral

Sources

• PubChem — compound 91604, checked 24 October 2026.
• PubChem — GHS classification (the ECHA C&L Inventory notifications and any harmonised EU entry), read 26 October 2026.
• IFRA — Standards Library, read 19 October 2026.
• EUR-Lex — Regulation (EC) No 1223/2009, Annex III.
• The Good Scents Company — Lyral — odour database.
• Commission Regulation (EU) 2017/1410 (copy on legislation.gov.uk) — regulatory record.
• US patent 10,597,605 — Composition having a muguet odor — published literature.
• Olfactory profile: the RUŌOD Lab team's synthesis of the published descriptions above, reviewed 24 October 2026. Evidence: more than one published description. Classification and the short description: revision 1. Descriptions of odour are judgement, not measurement.