fluorescein

synthetic organic compound used as dye and fluorescent tracer
ChemicalSubstance type_of_chemical_entity Q410922
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fluorescein

Summary

fluorescein is a type of chemical entity[1]. fluorescein ranks in the top 4% of type_of_chemical_entity entities by monthly Wikipedia readership (347 views/month).[2]

Key Facts

  • fluorescein's instance of is recorded as type of chemical entity[3].
  • fluorescein's chemical structure is recorded as Fluorescein 2.svg[4].
  • fluorescein's CAS Registry Number is recorded as 2321-07-5[5].
  • fluorescein's EC number is recorded as 219-031-8[6].
  • fluorescein's canonical SMILES is recorded as C1=CC=C2C(=C1)C(=O)OC23C4=C(C=C(C=C4)O)OC5=C3C=CC(=C5)O[7].
  • fluorescein's InChI is recorded as InChI=1S/C20H12O5/c21-11-5-7-15-17(9-11)24-18-10-12(22)6-8-16(18)20(15)14-4-2-1-3-13(14)19(23)25-20/h1-10,21-22H[8].
  • fluorescein's InChIKey is recorded as GNBHRKFJIUUOQI-UHFFFAOYSA-N[9].
  • fluorescein's ATC code is recorded as S01JA01[10].
  • fluorescein's chemical formula is recorded as C₂₀H₁₂O₅[11].
  • fluorescein's subclass of is recorded as chemical compound[12].
  • fluorescein's NDL Authority ID is recorded as 00577222[13].
  • fluorescein's has use is recorded as medication[14].
  • fluorescein's Commons category is recorded as Fluorescein[15].
  • fluorescein's MeSH descriptor ID is recorded as D019793[16].
  • fluorescein's ChEMBL ID is recorded as CHEMBL1057[17].
  • fluorescein's PDB structure ID is recorded as 4FAB[18].
  • fluorescein's Freebase ID is recorded as /m/02kks8[19].
  • fluorescein's UNII is recorded as TPY09G7XIR[20].
  • fluorescein's ChemSpider ID is recorded as 15968[21].
  • fluorescein's PubChem CID is recorded as 16850[22].
  • fluorescein's KEGG ID is recorded as D01261[23].
  • fluorescein's MeSH tree code is recorded as D02.455.426.779.347.390[24].
  • fluorescein's MeSH tree code is recorded as D03.633.300.953.275.390[25].
  • fluorescein's MeSH tree code is recorded as D04.711.347.390[26].
  • fluorescein's ZVG number is recorded as 112303[27].

Why It Matters

fluorescein ranks in the top 4% of type_of_chemical_entity entities by monthly Wikipedia readership (347 views/month).[2] fluorescein has Wikipedia articles in 24 language editions, a strong signal of global cultural recognition.[28] fluorescein is known by 48 alternative names across languages and contexts.[29]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] . wikidata.org.
  2. [4] . wikidata.org.
  3. [5] . Global Substance Registration System. Retrieved . commonchemistry.cas.org. Provenance: wikidata.org.
  4. [6] . Global Substance Registration System. Retrieved . wikidata.org.
  5. [7] . PubChem. Retrieved . wikidata.org.
  6. [8] . PubChem. Retrieved . wikidata.org.
  7. [9] . PubChem. Retrieved . wikidata.org.
  8. [10] . DrugBank. wikidata.org.
  9. [11] . PubChem. Retrieved . wikidata.org.
  10. [12] . wikidata.org.
  11. [13] . wikidata.org.
  12. [14] . DrugBank. wikidata.org.
  13. [15] . wikidata.org.
  14. [16] . NDF-RT. Retrieved . wikidata.org.
  15. [17] . ChEMBL. Retrieved . wikidata.org.
  16. [18] . wikidata.org.
  17. [19] . Freebase Data Dumps. wikidata.org.
  18. [20] . Global Substance Registration System. Retrieved . wikidata.org.
  19. [21] . Q2311683. Retrieved . wikidata.org.
  20. [22] . PubChem. Retrieved . wikidata.org.
  21. [23] . ChEBI. Retrieved . wikidata.org.
  22. [24] . wikidata.org.
  23. [25] . wikidata.org.
  24. [26] . wikidata.org.
  25. [27] . wikidata.org.

Class ancestry

  1. [1] . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] . Wikimedia Foundation. dumps.wikimedia.org.
  2. [28] . Wikidata sitelinks. wikidata.org.
  3. [29] . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). fluorescein. Retrieved May 3, 2026, from https://4ort.xyz/entity/fluorescein
MLA “fluorescein.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/fluorescein.
BibTeX @misc{4ortxyz_fluorescein_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{fluorescein}}, year = {2026}, url = {https://4ort.xyz/entity/fluorescein}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): fluorescein — https://4ort.xyz/entity/fluorescein (retrieved 2026-05-03)

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