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(-)-Isolongifolene

CAS 1135-66-6

2H-2,4a-Methanonaphthalene, 1,3,4,5,6,7-hexahydro-1,1,5,5-tetramethyl-, (2S,4aR)-

U.S. production volumes are classified as confidential business information.

Molecular structure of 1135-66-6
US productionCBI
Import value, 2024$90M
Top sourceJapan 21%

At least one company claimed its 2023 production or import volume for this chemical as confidential, so EPA withholds it.

Why supply is unknown

Production is reported production, not a complete census of factories. US production volume is confidential. Production reporting year: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 290219 · basket

EPA reports by year
2023
US production Confidential · Imports Confidential

These shares come from HS customs code 290219, which covers 108 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
JP 21%JapanBR 12%BrazilTW 12%TaiwanKR 11%South KoreaDE 9%Germany

Why It Matters

No EPA sector or FDA product records name a use for this chemical.

Chemical Identity

CAS1135-66-6
PubChem CIDNot recorded
DTXSIDDTXSID1044518
FormulaC15H24
Mol. Weight204.357 g/mol
SMILESCC1(C)[C@H]2CC[C@]3(C2)C1=CCCC3(C)C

Data Sources

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Brief citations

(-)-Isolongifolene (CAS 1135-66-6) https://chemicalindependence.com/chemical/1135-66-6/ EPA TSCA Inventory: CAS 1135-66-6. Retrieved 2026-04-29. https://www.epa.gov/tsca-inventory EPA Chemical Data Reporting: 1135-66-6. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 290219 for CAS 1135-66-6. Reporting year: 2024. https://usatrade.census.gov/