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3-METHYL-5-(2,2,3-TRIMETHYL-3-CYCLOPENTENYL)PENT-3-EN-2-ONE.

Optional CAS 65113-95-3 / PERFUMING

A synthetic fragrance compound that delivers a woody, sandalwood-like scent profile while acting as an effective fixative to extend the longevity of other fragrance notes. Commonly known by trade names Ebanol or Matsunol, this ketone isomer provides exceptional substantivity, lasting over 400 hours on skin.

perfuming fragrance fixative

Science

Functions exclusively as an olfactory agent by binding to olfactory receptors to produce its characteristic woody, creamy scent profile. Does not provide bioactive skincare benefits but serves as a fragrance fixative that enhances the permanence and projection of other aromatic compounds in formulations.


Research

Medium confidence
Effective range 0.1–1.5%
Optimal

0.5%

Key findings

  1. 01 Patch testing on 202 eczema/dermatitis patients showed potential sensitization reactions, confirming low-incidence allergen status

Transparency

Not commonly dusted
Min. effective
0.001%
Red flag below
1.5%

EU regulations require mandatory labeling above 0.001% in leave-on products due to fragrance allergen classification, preventing deceptive dusting practices


The Formula

Solubility
Oil
Optimal pH 2 – 11
0 7 14

Stability

Demonstrates exceptional pH stability across acidic to alkaline conditions, making it compatible with AHA/BHA formulations and alkaline soap bases

Synergies

  • Other fragrance compounds
  • Natural essential oils

Conflicts

  • Strong oxidizing agents
  • Hypochlorite bleaching agents

Safety

CIR Status
Not reviewed
Max tested
1.5%
Sensitization risk Low

Regulated under IFRA and EU fragrance allergen standards. Classified as potential but rare sensitizer with mandatory disclosure requirements above specific thresholds.


Your Skin

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Low
Comedogenicity Unknown

Our Assessment

Optional

A well-tolerated fragrance ingredient that excels at scent delivery but offers no skincare benefits beyond sensory enhancement.


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