Succimer

Drug ingredient

CAS 304-55-2

This chemical is an active pharmaceutical ingredient used in FDA-regulated drugs.

US productionNot reported

Import value, 2024$760M

Top sourceChina 33%

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 293090 · basket

These shares come from HS customs code 293090, which covers 418 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 33%ChinaES 14%SpainCH 9%SwitzerlandIT 7%ItalyIN 7%India

Israel
Croatia
Ukraine
Slovakia
United Arab Emirates
Ireland
Poland
Lithuania
Brazil
Singapore
Australia
Armenia
Hong Kong
Vietnam
Czech Republic
Hungary
Greece
Russia

6 FDA-registered drug labelers

DARMERICA, LLC

Hefei Lifeon Pharmaceutical Co., Ltd. (API branch)

Medisca Inc.

Piramal Pharma Limited

Recordati Rare Diseases, Inc.

Theragnostics Inc

Why It Matters

Sectors

Health

Downstream Uses

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

•NephroScan
•Chemet

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

$2.38/gAaron Chemicals LLC

CountryHong Kong

Pack$238.00 / 100 g

Purity97%

Vendors7 available

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

6 more vendors

Vendor	Country	$/g	Pack	Purity
Angene Chemical	China → Hong Kong	$2.56	100 g	95%
A2B Chem LLC	United States	$3.28	25 g	98%
AA BLOCKS	United States	$4.20	25 g	98%
Combi-Blocks, Inc.	United States	$5.60	100 g	98%
Angene International Limited	United States	$12.96	25 g	95%
Angene	China → Hong Kong	$4266.67	30 mg	95%

Chemical Identity

CAS304-55-2

PubChem CID2724354

DTXSIDDTXSID1023601

FormulaC4H6O4S2

Mol. Weight182.2 g/mol

SMILESC(C(C(=O)O)S)(C(=O)O)S

Data Sources

PubChem · compound 2724354Retrieved 2026-04-07
EPA TSCA InventoryRetrieved 2026-04-24
FDA National Drug Code directoryRetrieved 2026-04-07
US Census international tradeReporting year: 2024 · Retrieved 2026-10-04

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Brief citations

Succimer (CAS 304-55-2) https://chemicalindependence.com/chemical/304-55-2/ PubChem: 2724354. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/2724354 EPA TSCA Inventory: CAS 304-55-2. Retrieved 2026-04-24. https://www.epa.gov/tsca-inventory FDA National Drug Code directory: bulk match. Retrieved 2026-04-07. https://open.fda.gov/data/ndc/ US Census international trade: HS 293090 for CAS 304-55-2. Reporting year: 2024. https://usatrade.census.gov/