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Aromatic building blocks

Trimellitimide

Also known as 1H-Isoindole-5-carboxylic acid, 2,3-dihydro-1,3-dioxo-, 2,3-dihydro-1,3-dioxo-1h-isoindole-5-carboxylic acid, 1,3-dioxoisoindoline-5-carboxylic acid

CAS 20262-55-9Formula C9H5NO4Molar mass 191.14 g/molEC 817-857-9
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Harmful or irritant, Hazardous to the environment 1 supplier listed
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Trimellitimide chemical structure, C9H5NO4, CAS 20262-55-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
20262-55-9
Formula
C9H5NO4
Molar mass
191.14 g/mol
EC number
817-857-9
HS code
292519
Category
Aromatic building blocks

What is Trimellitimide?

Plain description, key identifiers and synonyms

Trimellitimide is a chemical substance with the molecular formula C9H5NO4 and a molar mass of 191.14 g/mol. Its CAS registry number is 20262-55-9. The IUPAC name is 1,3-dioxoisoindole-5-carboxylic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,3-dioxoisoindole-5-carboxylic acid
CAS number
20262-55-9 CAS number cross-checked
EC number
817-857-9
Molecular formula
C9H5NO4
UNII
U88MVD6RJK
MDL number
MFCD00462255
InChIKey
ARRQNZZBVOIEQQ-UHFFFAOYSA-N
InChI
InChI=1S/C9H5NO4/c11-7-5-2-1-4(9(13)14)3-6(5)8(12)10-7/h1-3H,(H,13,14)(H,10,11,12)
SMILES (canonical and isomeric)
C1=CC2=C(C=C1C(=O)O)C(=O)NC2=O

Synonyms

  • 1H-Isoindole-5-carboxylic acid, 2,3-dihydro-1,3-dioxo-
  • 2,3-dihydro-1,3-dioxo-1h-isoindole-5-carboxylic acid
  • 1,3-dioxoisoindoline-5-carboxylic acid
  • 4-Carboxyphthalimide
  • 1,3-Dioxo-2,3-dihydro-1H-isoindole-5-carboxylic acid
  • 1,3-dioxoisoindole-5-carboxylic acid
  • 5-Isoindolinecarboxylic acid, 1,3-dioxo-
  • 1,3-dioxoisoindoline-5-carboxylicacid
  • 1,3-Dioxo-5-isoindolinecarboxylic acid
  • 1,3-dioxo-2H-benzo[c]azoline-5-carboxylic acid
  • Cambridge id 5161464
  • 5-Isoindolinecarboxylic acid,3-dioxo-
  • 1,3-Dioxo-5-isoindolinecarboxylic acid #
  • 1H-Isoindole-5-carboxylic acid,3-dihydro-1,3-dioxo-
  • 1,3-dioxo-2,3-dihydro-1H-isoindole-5-carboxylic a acid, AldrichCPR

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
191.14 g/molcalc.
Exact mass
191.0219 Dacalc.
LogP (octanol/water)
0.27calc.
Topological polar surface area
83.47 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
1calc.
Heavy atoms
14calc.
Rings
2calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1NC(=O)c2ccccc21

O=C1NC(=O)c2ccccc21

2 rings, 11 atoms, the Phthalimide ring system.

2,700 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS07: Harmful or irritant
Harmful or irritant
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H301Toxic if swallowed.
  • H302Harmful if swallowed.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (22)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Trimellitimide suppliers

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Where suppliers are based

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Trimellitimide price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Inactive in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Trimellitimide is traded under.

HS 2925.19Indicative HS code

Imides and their derivatives, salts thereof, other

World exports in 2024
$295M
+11.7% vs 2023, imports $348M
2019 to 2024
Top exporters
  1. China29.7%
  2. Japan22.7%
  3. United Kingdom10.0%
Top importers
  1. United States12.7%
  2. Brazil12.6%
  3. China10.5%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Trimellitimide is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Trimellitimide, based on the data on this page

What is Trimellitimide?

Trimellitimide is a chemical substance with the molecular formula C9H5NO4 and a molar mass of 191.14 g/mol. Its CAS registry number is 20262-55-9. The IUPAC name is 1,3-dioxoisoindole-5-carboxylic acid.

What is the CAS number of Trimellitimide?

The CAS registry number of Trimellitimide is 20262-55-9.

What is the molecular formula and weight of Trimellitimide?

The molecular formula of Trimellitimide is C9H5NO4 and its molar mass is 191.14 g/mol.

What is Trimellitimide used for?

Known uses and roles of Trimellitimide include building blocks in research and laboratory and screening compounds in research and laboratory.

Is Trimellitimide hazardous?

Trimellitimide carries the GHS signal word "Danger". Main hazards: toxic if swallowed, harmful if swallowed, causes skin irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Trimellitimide?

Trimellitimide is usually classified under HS code 292519 (Imides and their derivatives, salts thereof, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Trimellitimide?

CompoundList lists 1 supplier of Trimellitimide in United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Trimellitimide?

Suppliers quote Trimellitimide on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Trimellitimide

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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