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C.I. Acid Yellow 23

Drug ingredient

CAS 1934-21-0

This drug ingredient has classified U.S. production volumes. EPA withholds the number as confidential business information.

Molecular structure of 1934-21-0
3 Na⁺
US productionCBI
Import value, 2024$56M
Top sourceIndia 70%

At least one company claimed its 2023 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: 2023. Import value and source-country shares describe a shared customs category, not a separate chemical measurement.

Where It Comes From

Customs basis: HS 320412 · basket

EPA reports by year
2023
US production Confidential · Imports Confidential
2019
US production Confidential · Imports Confidential

These shares come from HS customs code 320412, which covers 106 tracked chemicals in total. They estimate the category's origin mix, not this chemical specifically.

Source Countries
IN 70%IndiaMY 7%MalaysiaCH 4%SwitzerlandCN 4%ChinaDE 3%Germany
Domestic parents -- activity not disclosed (1)
Sensient Colors
EPA-registered importers (2)
Aakash Chemicals
Target

Why It Matters

Sectors
TextilesFoodHealthAgriculture
Downstream Uses

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

  • •Anubis Barcelona Regul Oil
  • •Anubis Barcelona
FDA Shortage Status
No FDA shortage records

Industrial Uses

Used in 3 sectors as 1 functional role.

  • •Dye in Agriculture, Forestry, Fishing and Hunting (10%)Processing—incorporation into formulation, mixture, or reaction product
  • •Dye in Food, beverage, and tobacco product manufacturing (90%)Processing—incorporation into formulation, mixture, or reaction product
  • •Dye in Synthetic Dye and Pigment Manufacturing (100%)Processing—incorporation into formulation, mixture, or reaction product

Vendor Pricing

$0.03/gAaron Chemicals LLC
CountryHong Kong
Pack$16.00 / 500 g
Purity97%
Vendors5 available

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

4 more vendors
VendorCountry$/gPackPurity
AA BLOCKSUnited States$0.08500 g85%
Sigma-Aldrich (Rush Stock)Germany$0.44500 g—
Sigma-AldrichGermany$0.44500 g—
AstaTech, IncUnited States$0.45100 g95%

Chemical Identity

CAS1934-21-0
PubChem CID164825
DTXSIDDTXSID1021455
FormulaC16H9N4Na3O9S2
Mol. Weight534.4 g/mol
SMILESC1=CC(=CC=C1N=NC2C(=NN(C2=O)C3=CC=C(C=C3)S(=O)(=O)[O-])C(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+].[Na+]

Data Sources

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Brief citations

C.I. Acid Yellow 23 (CAS 1934-21-0) https://chemicalindependence.com/chemical/1934-21-0/ EPA CompTox (DSSTox): DTXSID1021455. Retrieved 2026-04-06. https://comptox.epa.gov/dashboard/chemical/details/DTXSID1021455 PubChem: 164825. Retrieved 2026-04-06. https://pubchem.ncbi.nlm.nih.gov/compound/164825 EPA Chemical Data Reporting: 1934-21-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting EPA Chemical Data Reporting: CAS 1934-21-0. Reporting year: 2023. https://www.epa.gov/chemical-data-reporting US Census international trade: HS 320412 for CAS 1934-21-0. Reporting year: 2024. https://usatrade.census.gov/