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Fluorescein

Drug ingredient

CAS 2321-07-5

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

Molecular structure of 2321-07-5
US productionNot reported
Import value, 2024$14M
Top sourceIndia 21%

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 320490 · basket

These shares come from HS customs code 320490, which covers 9 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 21%IndiaKR 18%South KoreaGB 13%United KingdomDE 10%GermanyBE 8%Belgium
3 FDA-registered drug labelers
Abbey Color Incorporated
DELMAR CHEMICALS INC
Nexus Pharmaceuticals LLC

Why It Matters

Sectors
Health
Downstream Uses

Appears in 1 drug and cosmetic product listings (FDA).

  • •Fluorescein
FDA Shortage Status
No FDA shortage records

Chemical Identity

CAS2321-07-5
PubChem CID16850
DTXSIDDTXSID0038887
FormulaC20H12O5
Mol. Weight332.3 g/mol
SMILESC1=CC=C2C(=C1)C(=O)OC23C4=C(C=C(C=C4)O)OC5=C3C=CC(=C5)O

Data Sources

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Brief citations

Fluorescein (CAS 2321-07-5) https://chemicalindependence.com/chemical/2321-07-5/ PubChem: 16850. Retrieved 2026-04-07. https://pubchem.ncbi.nlm.nih.gov/compound/16850 EPA TSCA Inventory: CAS 2321-07-5. 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 320490 for CAS 2321-07-5. Reporting year: 2024. https://usatrade.census.gov/