Butylbenzene

Drug ingredient

CAS 104-51-8

This drug ingredient has classified U.S. production volumes. EPA withholds the number 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$68M

Top sourceIndia 35%

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 290290 · basket

EPA reports by year

2019: US production Confidential · Imports Confidential

These shares come from HS customs code 290290, which covers 171 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).

IN 35%IndiaTW 11%TaiwanES 10%SpainDE 10%GermanyCN 8%China

Czech Republic
Netherlands
Switzerland
Pakistan
United Kingdom
Austria
Denmark
Indonesia
Lithuania
Hong Kong
Finland

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.

Dow Chemical

2 FDA-registered drug labelers

Deseret Biologicals, Inc.

Dr. Donna Restivo DC

Why It Matters

Sectors

Health

Downstream Uses

Appears in 2 drug and cosmetic product listings (FDA).

•Chemtox
•ChemDetox

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

Vendor Pricing

$0.25/gCombi-Blocks, Inc.

CountryUnited States

Pack$250.00 / 1 kg

Purity98%

Vendors7 available

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

6 more vendors

Vendor	Country	$/g	Pack	Purity
A2B Chem LLC	United States	$0.27	1 kg	98%
AA BLOCKS	United States	$0.28	1 kg	98%
ALFA AESAR	Germany	$0.54	1 kg	99%
Otava, Ltd.	Ukraine	$2280.00	50 mg	95%
Otava, Ltd. (2 weeks)	Ukraine	$2724.00	50 mg	95%
TimTec, LLC	United States	$90000.00	2 mg	90%

Chemical Identity

CAS104-51-8

PubChem CID7705

DTXSIDDTXSID6022472

FormulaC10H14

Mol. Weight134.22 g/mol

SMILESCCCCC1=CC=CC=C1

Data Sources

EPA CompTox (DSSTox) · DTXSID6022472Retrieved 2026-04-06
PubChem · compound 7705Retrieved 2026-04-06
EPA Chemical Data ReportingReporting year: 2019 · Retrieved 2026-10-04
FDA National Drug Code directoryRetrieved 2026-04-07
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Butylbenzene (CAS 104-51-8) https://chemicalindependence.com/chemical/104-51-8/ EPA CompTox (DSSTox): DTXSID6022472. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID6022472 PubChem: 7705. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/7705 EPA Chemical Data Reporting: 104-51-8. Reporting year: 2019. https://www.epa.gov/chemical-data-reporting FDA National Drug Code directory: CAS 104-51-8. Retrieved 2026-04-07. https://open.fda.gov/data/ndc/ US Census international trade: HS 290290 for CAS 104-51-8. Reporting year: 2024. https://usatrade.census.gov/