Hydroxymethylpentylcyclohexenecarboxaldehyde is a synthetic fragrance known by the trade names Lyral, Kovanol, Mugonal, Landolal. It is found in some soaps, eau de toilettes, aftershaves and deodorants.

Quick Facts Names, Identifiers ...

Hydroxymethylpentyl­cyclohexenecarboxaldehyde^[1]

Names
Preferred IUPAC name 4-(4-Hydroxy-4-methylpentyl)cyclohex-3-ene-1-carbaldehyde
Other names Lyral, Kovanol, Mugonal, Landolal
Identifiers
CAS Number	31906-04-4 Y
3D model (JSmol)	Interactive image
ChemSpider	82714 N
ECHA InfoCard	100.046.225
EC Number	250-863-4
PubChem CID	91604
UNII	QUE43B9Z2Q Y
CompTox Dashboard (EPA)	DTXSID1027970
InChI InChI=1S/C13H22O2/c1-13(2,15)9-3-4-11-5-7-12(10-14)8-6-11/h5,10,12,15H,3-4,6-9H2,1-2H3 N Key: ORMHZBNNECIKOH-UHFFFAOYSA-N N InChI=1/C13H22O2/c1-13(2,15)9-3-4-11-5-7-12(10-14)8-6-11/h5,10,12,15H,3-4,6-9H2,1-2H3 Key: ORMHZBNNECIKOH-UHFFFAOYAY
SMILES O=CC1C/C=C(/CCCC(O)(C)C)CC1
Properties
Chemical formula	C13H22O2
Molar mass	210.317 g·mol−1
Density	0.995 g/mL at 20 °C
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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Typical synthesis starts from myrcene^[2] and involves a Diels–Alder reaction with acrolein to produce the cyclohexenecarbaldehyde group, this species is marketed as a fragrance in its own right, most commonly under the name 'myrac aldehyde'. Acid-catalyzed hydration of this completes the synthesis by forming the tertiary alcohol.

Lyral is known to act as a skin allergen and is listed as such in EU Directive 76/768/EEC.^[3] It is commonly tested for in patients undergoing patch testing.^[4]