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Isoindigotin

3-(2-hydroxy-1H-indol-3-yl)indol-2-one · also: Isoindigo · 3,3'-biindole 2,2'(1h,1'h)-dione · (2-oxoindolin-3-ylidene)indolin-2-one · (3E)-3-(2-oxoindolin-3-ylidene)indolin-2-one · (3E)-3-(2-oxo-1H-indol-3-ylidene)-1H-indol-2-one · 1,1',3,3'-tetrahydro-3,3'-bis(2H-indol-3-ylidene)-2,2'-dione

FormulaC16H10N2O2
Mol. weight262.268
PubChem CID164610
InChIKeyVBMISAYWIMDRCV-UHFFFAOYSA-N
SMILESC1=CC=C2C(=C1)C(=C(N2)O)C3=C4C=CC=CC4=NC3=O
954Patents
28Research papers
221Patents - last 3 years
3Papers - last 3 years

Who owns the IP

The organizations most actively patenting around this compound, ranked by referenced patent volume.

#AssigneePatents
1Chinese Academy of Sciences44
2LG Chem Ltd40
3Shell PLC19
4Oceans King Lighting Science and Technology Co Ltd16
5Berkshire Hathaway Inc15
6Hydro-Québec15
7Murata Manufacturing Co Ltd15
8Sony Group Corp15
9L'Oréal SA12
10Leland Stanford Junior University11

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This preview shows the leading assignees. Cypris reveals the full ownership landscape - every filing entity, filing trends, and portfolio momentum.

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Where innovation is concentrated

Patent classifications ranked by volume reveal the technical domains with the most active filing.

#CodeAreaPatents
1H10KOrganic semiconductors / OLEDs304
2Y02EClimate change mitigation: energy291
3C07DHeterocyclic compounds207
4C08GPolymers from non-vinyl bonds (e.g. polyamides, polyesters)202
5A61PTherapeutic activity (drug indications)144
6A61KMedicinal preparations134
7C09KMaterials for misc. applications102
8H01LSemiconductor devices81
9C08FPolymers from C=C unsaturated bonds65
10C09DCoatings, paints, varnishes65

AI mapped opportunity space

This preview shows where patent activity concentrates. Cypris maps the full classification landscape to surface technical whitespace and IP headroom.

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Representative patents

The filings that best characterise the patent activity around this compound, most-referenced first.

TitleYearAssigneeCited by
Derivative of isoindigo, indigo and indirubin for the treatment of cancer200323
Derivatives of isoindigo, indigo and indirubin and methods of treating cancer200519
CONJUGATED POLYMER CONTAINING ISOINDIGO UNITS, PREPARATION METHOD AND USE THEREOF2012Oceans King Lighting Science and Technology Co Ltd12
Isoindigo based co-polymer organic semiconductor material, and preparation method and application thereof2013Oceans King Lighting Science and Technology Co Ltd11
Isoindigo based co-polymer solar cell material, and preparation method and application thereof2013Oceans King Lighting Science and Technology Co Ltd11

How research activity has moved

Papers published per year for this compound, over the last decade of indexed records.

YearPapers
20161
20181
20211
20221
20232
20241

Who's driving the science

The most-published authors working with this compound, alongside their primary affiliations.

#AuthorAffiliationPapers
1Mustafa M. El‐AbadelahUniversity of Jordan5
2Jalal A. ZahraUniversity of Jordan4
3Salim S. SabriUniversity of Jordan4
4Ayman SalehNational Guard Health Affairs4
5Mei‐Lin GoNational University of Singapore3
6Ahmad AljadaNational Guard Health Affairs3
7Mohammad Azhar AzizNational Guard Health Affairs3
8Mutasem O. TahaUniversity of Jordan3
9Scott W. NelsonIowa State University2
10Fadoua BouchikhiUniversité Clermont Auvergne2

Research leaders

This preview lists the top authors. Cypris surfaces the full researcher landscape, their affiliations, and how scientific influence is shifting.

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The literature that defines it

The most-cited papers anchoring the scientific record for this compound.

Frequently asked questions

Common questions about this compound's patent and research landscape, answered from the underlying data.

What is the molecular formula and weight of isoindigotin?

Isoindigotin has the molecular formula C16H10N2O2 and a molecular weight of 262.268 g/mol. Its canonical IUPAC name is 3-(2-hydroxy-1H-indol-3-yl)indol-2-one.

Which organizations hold the most patents involving isoindigotin?

The Chinese Academy of Sciences leads with 44 patents, followed by LG Chem Ltd with 40 patents. Other major patent holders include Shell PLC with 19 patents, Oceans King Lighting Science and Technology Co Ltd with 16 patents, and Berkshire Hathaway Inc, Hydro-Québec, Murata Manufacturing Co Ltd, and Sony Group Corp each with 15 patents.

What are the main patent technology areas for isoindigotin applications?

The leading CPC subclasses for isoindigotin patents are H10K (organic optoelectronics) with 304 patents, Y02E (renewable energy) with 291 patents, and C07D (heterocyclic compounds) with 207 patents. Significant coverage also exists in C08G (macromolecular compounds), A61P (medical/pharmaceutical uses), and A61K (pharmaceutical compositions).

How has patent activity for isoindigotin changed in recent years?

Patent filings for isoindigotin have grown significantly, with 33 patents in 2016 increasing to a peak of 118 patents in 2023. The trend shows steady growth through 2022, reaching 112 patents, followed by 101 patents in 2024 and 68 patents in 2025.

What research topics are covered in papers on isoindigotin?

Academic papers on isoindigotin span multiple topics: organic electronics and photovoltaics (including a 2013 paper with 118 citations), cancer therapeutics (including a 2006 ab initio study with 77 citations), asymmetric synthesis and catalysis (2015, 66 citations), nanoplatforms for cancer theranostics (2016, 60 citations), and toxic organic pollutants impact (2007, 36 citations).

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