C8H5NO2
147.13 g/mol
Dye & PigmentWarning
Isatin
CAS91-56-5EC202-077-8
Category
Dye & Pigment
Compound Class
Heterocycle
Primary Use
dye and pigment intermediate
Isatin, also known as tribulin, is an organic compound derived from indole. It was first obtained in 1840 as a product from the oxidation of indigo dye.
dye and pigment intermediate
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
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2-Naphthalenecarboxamide, N,N'-(3,3'-dimethoxy[1,1'-biphenyl]-4,4'-diyl)bis[3-hydroxy-
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Naphthol dye intermediate
Safety Reference
Warning
H317May cause an allergic skin reaction
H412Harmful to aquatic life with long lasting effects
Customs Tariff Classification
The international HS code for Isatin (CAS 91-56-5) is 2933.79.
HS code (international, 6-digit)
2933.79
EU CN code (8-digit)
2933 79 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
1H-indole-2,3-dione
InChIKey
JXDYKVIHCLTXOP-UHFFFAOYSA-N
SMILES
C1=CC=C2C(=C1)C(=O)C(=O)N2
Synonyms (30)
- 1H-Indole-2,3-dione
- 1H-benzo[d]azoline-2,3-dione
- 2,3-Diketoindoline
- 2,3-Dioxo-2,3-dihydroindole
- 2,3-Dioxoindoline
- 2,3-Indolinedione
- 2,3-Ketoindoline
- 2,3-dihydroindole-2,3-dione
- 2H-indole-2,3-dione
- 3-Indolinedione
- 3-hydroxy-2-indolone
- INDOLE-2,3-DIONE
- Indole-2
- Indoline-2,3-dione
- Isatic acid lactam
- Isatin
- Isatin (Compound 1)
- Isatin, p.a.
- Isatine
- Isatinic acid anhydride
- Isotin
- Pseudoisatin
- S00335a
- Tribulin
- hydroxy-3-indolone
- indol-2
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