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Hydroxyisohexyl 3-cyclohexene carboxaldehyde (HICC)

Hydroxyisohexyl 3-cyclohexene carboxaldehyde, HICC, was a muguet material of the twentieth century; EU law now prohibits it in cosmetic products.

From 23 August 2019 cosmetic products containing it could not be placed on the EU market. IFRA’s Standard, published in 2020, restricts it. Its identity is PubChem’s.

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In your room

A model you can turn here or place in your room with a phone. Nothing is fetched until you ask; nothing is stored or sent. Everything you can place in a room.

An engraved drawing of the hydroxyisohexyl 3-cyclohexene carboxaldehyde (HICC) model: hatched atoms joined by ruled bonds, the hydrogens left out.

molecule

The hydroxyisohexyl 3-cyclohexene carboxaldehyde (HICC) molecule

A computed 3D conformer , modeled, not a photograph of a molecule. PubChem CID 91604.

To place it in your room, open this page on an iPhone or iPad (AR Quick Look) or an Android phone (Google Scene Viewer). The files below open in any 3D viewer.

PubChem’s computed 3D conformer of hydroxyisohexyl 3-cyclohexene carboxaldehyde (HICC) (CID 91604, conformer 000165D400000003): the shape a computer model gives the molecule, not an experimental structure and not a picture of a real molecule. Ball and stick: 13 carbon, 2 oxygen; the 22 hydrogen atoms are left out for clarity. The balls are drawn smaller than the atoms’ real reach; a double bond is two sticks, side by side.

In the room
scaled so that one ångström is 4 cm (about 400 million times life size): 20.7 cm tall, 31.8 cm across
Atoms
13 carbon, 2 oxygen · 15 bonds between them
Colours
carbon: ink sepia-2; oxygen: rose highlight; bonds: brass. Colour is a convention here and never carries the meaning alone: the letters on the drawing and this list say which atom is which.
Source
PubChem, CID 91604 (National Center for Biotechnology Information), its computed 3D conformer as filed on this record
Licence
PubChem’s data are public (NCBI); the model and its drawing were made for this site from those coordinates

The files GLB 22 KB · USDZ 51 KB · the drawing (SVG) 5 KB

The record

Each field carries its evidence: open a chip for the source, the quoted words and the confidence. A field with nothing behind it says so and stays empty.

Name
hydroxyisohexyl 3-cyclohexene carboxaldehyde (HICC)
documented

79 3 and 4-(4-Hydroxy-4-methylpentyl)cyclohex-3-ene-1-carbaldehyde Hydroxyisohexyl 3-cyclohexene carboxaldehyde 51414-25-6/31906-04-4

EU-2009-1223 · Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products… · read 2026-09-30

the INCI name EU law uses; IFRA calls it HMPCC; PubChem’s title for CID 91604 is "Liral", a trade name

confidence A

CAS
31906-04-4
documented

31906-04-4

PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral · read 2026-09-30

among the CID’s PubChem synonyms, and PubChem resolves it back to this CID

confidence A

PubChem CID
91604
documented

PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral · read 2026-09-30

confidence A

Formula
C13H22O2
documented

PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral · read 2026-09-30

confidence A

Molecular weight
210.31
documented

PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral · read 2026-09-30

g/mol, as PubChem states it

confidence A

IUPAC name
4-(4-hydroxy-4-methylpentyl)cyclohex-3-ene-1-carbaldehyde
documented

PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral · read 2026-09-30

confidence A

SMILES
CC(C)(CCCC1=CCC(CC1)C=O)O
documented

PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral · read 2026-09-30

confidence A

InChIKey
ORMHZBNNECIKOH-UHFFFAOYSA-N
documented

PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral · read 2026-09-30

confidence A

Odour threshold
withheld: not on record
withheld

no odour-threshold source on record

Descriptors
not on record
not on record

no descriptor on record: no house wording on a data file, no descriptor source filed

Volatility class
not on record
not on record

no volatility class on record for hicc (the house’s volatility table has no entry)

Regulation
documented

IFRA-044, EU-2009-1223, EU-2017-1410: each record above quotes its entry.

3D structure
PubChem computed 3D conformer · 37 atoms, 37 bonds
modeled

PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral · read 2026-09-30

PubChem’s computed 3D conformer (the 3D SDF record): a model, drawn schematically, not an experimental structure

confidence A

Wikidata
Q5955634
documented

P662 PubChem CID: 91604

WD-1 · Wikidata (Wikimedia Foundation) · read 2026-09-30

the item states PubChem CID 91604 (P662) and the record’s InChIKey (P235); found by the statement search haswbstatement:P662=91604

confidence A

Odeuropa
EOKG concept
documented

{"concept":"http://data.odeuropa.eu/vocabulary/dravnieks/odorants/91","relation":"owl:sameAs","via":"Q5955634","label":"Lyral","scheme":"http://data.odeuropa.eu/vocabulary/dravnieks/odorants/"}

ODEUROPA-1 · Lisena, P., Ehrhart, T., Troncy, R · read 2026-09-30

the EOKG concept “Lyral” states owl:sameAs Q5955634 and the record’s CAS (wdt:P231)

confidence A

Occurs in
    In teaching accords
    In history

    Sources

    1. PUBCHEM-91604 · PubChem Compound Summary for CID 91604, Liral (4-(4-hydroxy-4-methylpentyl)cyclohex-3-ene-1-carbaldehyde). National Center for Biotechnology Information (NCBI), U.S. National Library of Medicine; live database, read 2026-09-30 through the PUG REST endpoints (no account): https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/name/31906-04-4/cids/JSON · https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/91604/property/MolecularFormula,MolecularWeight,IUPACName,Title,SMILES,InChIKey/JSON · https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/91604/synonyms/JSON · https://pubchem.ncbi.nlm.nih.gov/rest/pug/compound/cid/91604/SDF?record_type=3d. pubchem.ncbi.nlm.nih.gov/compound/91604 · read 2026-09-30 · public domain (US government work, NCBI/NLM); acknowledgement requested , cite PubChem
    2. EU-2009-1223 · Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products (recast). OJ L 342, 22.12.2009, p. 59. eur-lex.europa.eu/eli/reg/2009/1223/oj · read 2026-09-30 · EU reuse policy (Commission Decision 2011/833/EU): reuse for commercial or non-commercial purposes, with acknowledgement of the source
    3. WD-1 · Wikidata (Wikimedia Foundation): the items named on each record (each statement read with its references), read 2026-09-30. www.wikidata.org · read 2026-09-30 · CC0 1.0
    4. ODEUROPA-1 · Lisena, P., Ehrhart, T., Troncy, R. European Olfactory Knowledge Graph (EOKG), Odeuropa project. Zenodo, 2024. doi:10.5281/zenodo.10709703. SPARQL endpoint https://data.odeuropa.eu/repositories/odeuropa, read 2026-09-30. doi.org/10.5281/zenodo.10709703 · read 2026-09-30 · CC BY 4.0

    Our text and structure are CC BY 4.0; quoted source text stays under its owners’ terms.

    this record as data: /data/molecule/hicc.json · version 3 · updated 2026-10-01 · confidence A