Pyrrole

Drug ingredient

CAS 109-97-7

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

US productionNot reported

Import value, 2024$1.4B

Top sourceIreland 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 293399 · basket

These shares come from HS customs code 293399, which covers 518 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).

IE 33%IrelandCN 26%ChinaIN 11%IndiaDE 9%GermanyIT 4%Italy

Taiwan
Poland
Canada
Ivory Coast
Greece
Hungary
Indonesia
Latvia
Belgium
Slovakia
Czech Republic
Austria
Netherlands
Finland
Denmark
Croatia
Australia
South Africa
Sweden
Hong Kong
Malta
Singapore
Lithuania
Malaysia
Oman
Serbia

4 FDA-registered drug labelers

Deseret Biologicals, Inc.

Dr. Donna Restivo DC

Energique, Inc.

Pro Weight Loss Inc.

Why It Matters

Sectors

Health

Downstream Uses

Appears in 4 drug and cosmetic product listings (FDA).

•Perfect Sleep
•Sleep Tight
•Multi-Phenolic
•Sleep Aid

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

$0.16/gManchester Organics

CountryUnited Kingdom

Pack$77.56 / 500 g

Purity99%

Vendors12 available

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

11 more vendors

Vendor	Country	$/g	Pack	Purity
Sigma-Aldrich (Rush Stock)	Germany	$0.26	5 kg	98%
Sigma-Aldrich	Germany	$0.26	5 kg	98%
Fluorochem UK	United Kingdom	$0.26	475 g	99%
Fluorochem EU	Germany	$0.26	475 g	99%
A2B Chem LLC	United States	$0.36	500 g	98%
Combi-Blocks, Inc.	United States	$0.36	500 g	97%
AA BLOCKS	United States	$0.41	500 g	98%
ALFA AESAR	Germany	$0.59	1 kg	98%
Key Organics Ltd.	United Kingdom	$0.74	100 g	95%
Interbioscreen	Hong Kong	$10.00	10 g	95%
Labotest KG	Germany	$453.00	1000 mg	90%

Chemical Identity

CAS109-97-7

PubChem CID8027

DTXSIDDTXSID5021910

FormulaC4H5N

Mol. Weight67.09 g/mol

SMILESC1=CNC=C1

Data Sources

PubChem · compound 8027Retrieved 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

Pyrrole (CAS 109-97-7) https://chemicalindependence.com/chemical/109-97-7/ PubChem: 8027. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/8027 EPA TSCA Inventory: CAS 109-97-7. 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 293399 for CAS 109-97-7. Reporting year: 2024. https://usatrade.census.gov/