9-Octadecenoic acid (9Z)-, 2-mercaptoethyl ester

CAS 59118-78-4

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

US productionCBI

Confidential Business Information. The EPA withholds this volume because publishing it could reveal the reporting company's trade secrets.

Top sourceNo public record

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.

Where It Comes From

EPA reports by year

2023: US production Confidential · Imports Confidential
2019: US production Confidential · Imports Confidential

EPA-registered manufacturers (1)

Companies that report making or importing this chemical to the EPA. Registration is US-centric and does not indicate import origin.

Pmc Group N.A

Domestic parents -- activity not disclosed (1)

EPA records name a US company for this chemical but do not disclose whether the company made it here or imported it.

Polymer Additves

Why It Matters

Sectors

Plastics & RubberCore Chemicals

Downstream UsesNot recorded

FDA Shortage Status

Whether any manufacturer currently reports this drug as in shortage on the FDA Drug Shortages database. "Active Shortage" means at least one presentation has status "current."

No FDA shortage records

Industrial Uses

Used in 2 sectors as 2 functional roles.

•Intermediate in All Other Chemical Product and Preparation Manufacturing (100%)Processing as a reactant
•Heat stabilizer in Plastics Product ManufacturingProcessing—incorporation into article

Chemical Identity

CAS59118-78-4

PubChem CID6436848

DTXSIDDTXSID4028048

FormulaC20H38O2S

Mol. Weight342.6 g/mol

SMILESCCCCCCCCC=CCCCCCCCC(=O)OCCS

Data Sources

EPA CompTox (DSSTox) · DTXSID4028048Retrieved 2026-04-06
PubChem · compound 6436848Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2023 · Retrieved 2026-10-04

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Brief citations

9-Octadecenoic acid (9Z)-, 2-mercaptoethyl ester (CAS 59118-78-4) https://chemicalindependence.com/chemical/59118-78-4/ EPA CompTox (DSSTox): DTXSID4028048. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID4028048 PubChem: 6436848. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/6436848 EPA Chemical Data Reporting: 59118-78-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 59118-78-4. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting