O,O-Diethyl chlorothiophosphate

CAS 2524-04-1

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.

Import value, 2024$208M

Top sourceChina 28%

At least one company claimed its 2019 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: 2019. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 292090 · basket

EPA reports by year

2019: US production Confidential · Imports Confidential

These shares come from HS customs code 292090, which covers 98 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries

Country of origin for US imports, from Census customs data (2024).

CN 28%ChinaKR 17%South KoreaIT 13%ItalyIN 10%IndiaDE 9%Germany

Poland
Switzerland
Ireland
Canada
Lithuania
Netherlands
Brazil
Malaysia
Hungary
Czech Republic
Saudi Arabia
Slovakia
Ukraine
Turkey

EPA-registered importers (1)

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

Corteva

Why It Matters

Sectors

Agriculture

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

•Intermediate in Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing (100%)Processing as a reactant

Vendor Pricing

$0.26/gA2B Chem LLC

CountryUnited States

Pack$130.00 / 500 g

Purity97%

Vendors6 available

Prices reflect listed pack sizes. Small research packs run far above bulk rates.

5 more vendors

Vendor	Country	$/g	Pack	Purity
AA BLOCKS	United States	$0.34	500 g	97%
Combi-Blocks, Inc.	United States	$0.64	500 g	97%
Sigma-Aldrich (Rush Stock)	Germany	$0.71	100 g	97%
Sigma-Aldrich	Germany	$0.71	100 g	97%
AK Scientific, Inc.	United States	$1.47	100 g	98%

Chemical Identity

CAS2524-04-1

PubChem CID17305

DTXSIDDTXSID5027487

FormulaC4H10ClO2PS

Mol. Weight188.61 g/mol

SMILESCCOP(=S)(OCC)Cl

Data Sources

EPA CompTox (DSSTox) · DTXSID5027487Retrieved 2026-04-06
PubChem · compound 17305Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

O,O-Diethyl chlorothiophosphate (CAS 2524-04-1) https://chemicalindependence.com/chemical/2524-04-1/ EPA CompTox (DSSTox): DTXSID5027487. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID5027487 PubChem: 17305. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/17305 EPA Chemical Data Reporting: 2524-04-1. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 2524-04-1. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 292090 for CAS 2524-04-1. Reporting year: 2024. https://usatrade.census.gov/