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Pyrethrin II

CAS 121-29-9

Cyclopropanecarboxylic acid, 3-[(1E)-3-methoxy-2-methyl-3-oxo-1-propen-1-yl]-2,2-dimethyl-, (1S)-2-methyl-4-oxo-3-(2Z)-2,4-pentadien-1-yl-2-cyclopenten-1-yl ester, (1R,3R)-

Molecular structure of 121-29-9
US productionNot reported
Import value, 2024$37M
Top sourceChina 25%

This chemical is listed as active in US commerce, but no company reported it to EPA’s survey for 2019 or 2023. Sites may have made or imported less than the threshold amount, or none.

Why supply is unknown

Production is reported production, not a complete census of factories. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 291720 · basket

These shares come from HS customs code 291720, which covers 42 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
CN 25%ChinaIT 21%ItalyJP 21%JapanDE 14%GermanyIN 9%India

Why It Matters

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

Chemical Identity

CAS121-29-9
PubChem CIDNot recorded
DTXSIDDTXSID2042353
FormulaC22H28O5
Mol. Weight372.461 g/mol
SMILESCOC(=O)C(\C)=C\[C@@H]1[C@@H](C(=O)O[C@H]2CC(=O)C(C\C=C/C=C)=C2C)C1(C)C

Data Sources

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Brief citations

Pyrethrin II (CAS 121-29-9) https://chemicalindependence.com/chemical/121-29-9/ EPA TSCA Inventory: CAS 121-29-9. Retrieved 2026-10-04. https://www.epa.gov/tsca-inventory US Census international trade: HS 291720 for CAS 121-29-9. Reporting year: 2024. https://usatrade.census.gov/