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Herbicides

Endothall

Also known as Aquothol, Hydrothol, Hydout

CAS 145-73-3Formula C8H10O5Molar mass 186.16 g/molEC 205-660-5
GHS signal word: Danger. Pictograms: Acute toxicity (severe) 2 suppliers listed
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Endothall chemical structure, C8H10O5, CAS 145-73-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Cyrstalline, white solid
Melting point
90 °C
Density
1.431
Solubility
In water, 1.0 × 10⁺⁵ mg/L at 20 °C
HS code
293299
Category
Herbicides
UN number
UN 2811
Illustrative photo, a white jumbo bulk bag of powder in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Endothall?

Plain description, key identifiers and synonyms

The monohydrate is in the form of colorless crystals. Non corrosive. Used as a selective herbicide.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(1S,2R,3S,4R)-7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid
CAS number
145-73-3 CAS number cross-checkedOther or deprecated CAS: 28871-63-8, 28874-46-6
EC number
205-660-5
Molecular formula
C8H10O5
UNII
18F7018HG1
InChIKey
GXEKYRXVRROBEV-FBXFSONDSA-N
InChI
InChI=1S/C8H10O5/c9-7(10)5-3-1-2-4(13-3)6(5)8(11)12/h3-6H,1-2H2,(H,9,10)(H,11,12)/t3-,4+,5-,6+
Canonical SMILES
O=C(O)C1C2CCC(O2)C1C(=O)O
Isomeric SMILES
C1C[C@H]2[C@@H]([C@@H]([C@@H]1O2)C(=O)O)C(=O)O

Synonyms

  • Aquothol
  • Hydrothol
  • Hydout
  • Herbon pennout
  • Des-i-cate
  • Aquathol
  • Herbicide 273
  • Endothall Weed Killer
  • Aquathol Plus Granular
  • Endothall Turf Herbicide
  • 3,6-Endooxyphthalic acid, hexahydro-
  • Tri-Endothal
  • 3,6-Endoxohexahydrophthalic acid
  • Endothal technical
  • 1,2-Cyclohexanedicarboxylic acid, 3,6-endo-epoxy-
  • 1,2-Benzenedicarboxylic acid, hexahydro-3,6-endo-oxy-
  • Phthalic acid, hexahydro-3,6-endo-oxy-
  • 3,6-Epoxycyclohexane-1,2-dicarboxylic acid
  • 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid
  • Endothal
  • (1r,2s,3r,4s)-7-oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid
  • Endothalic acid
  • rel-(1R,2S,3R,4S)-7-Oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid
  • Aquathol Plus
  • Endothallic acid
Show all 33 synonyms
  • ENL
  • (endo,endo)-endothal
  • (endo,endo)-7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid
  • 7-Oxabicyclo(2.2.1)heptane-2,3-dicarboxylic acid, (endo,endo)-
  • Endothal, (+/-)-
  • RCRA waste no. P088
  • 7-Oxabicyclo[2.2.1]heptane-2,3-dicarboxylic acid, (1R,2S,3R,4S)-rel-
  • 3,6-Endooxohexahydrophthalic acid

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

Appearance
Cyrstalline, white solidexp.
Odour
Odorlessexp.
Melting point
90 °Cexp.
Density
1.431exp.
Solubility
In water, 1.0 × 10⁺⁵ mg/L at 20 °Cexp.
Vapour pressure
1.57 × 10⁻¹⁰ mm Hg at 24 °Cexp.

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
186.16 g/molcalc.
Exact mass
186.0528 Dacalc.
LogP (octanol/water)
-0.05calc.
Topological polar surface area
83.83 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
13calc.
Rings
2calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.75calc.
Formal charge
0calc.
Stereocentres
4calc.
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, C1CC2CCC1O2

C1CC2CCC1O2

2 rings, 7 atoms, the 7-Oxabicyclo(2.2.1)heptane ring system.

612 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)

Hazard statements

  • H301Toxic if swallowed.
  • H312Harmful in contact with skin.
  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (20)
  • 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.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • 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.
  • P317Get medical help.
  • 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.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2811

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

Endothall suppliers

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All 2 suppliers

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Where suppliers are based

2 suppliers in 1 country

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Endothall 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

Algaecide, defoliant/desiccant, herbicide, plant growth regulator.

Aquatic herbicide to control submerged aquatic vegetation and algae in lakes, ponds, and irrigation canals.

Endothall has one biocide use to control mollusks and algae in cooling towers/systems.

Use classes: Herbicides.

Functional uses

  • Biocide

How it is made

Endothall is made by the condensation of furan and maleic anhydride ... The reaction is conducted at 35 °C and atmospheric pressure in the liquid phase. Isopropyl ether may be used as a reaction diluent. No catalyst is used and the reaction time is about 7 hours.

Endothal is made by reduction of the Diels-Alder condensation product of furan and maleic anhydride.

Furan undergoes the Diels-Alder reaction with strong dienophiles. Hydrogenation of the product resulting from reaction with maleic anhydride, followed by hydrolysis and neutralization gives a herbicide, endothall.

Regulatory status

Inventories, regulations and trade controls that list this substance

Europe

  • EU harmonised classification (CLP Annex VI)
    Index no: 607-150-00-1

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2932.99Indicative HS code

Heterocyclic compounds with oxygen hetero-atom(s) only, other

World exports in 2024
$3.81B
+10.3% vs 2023, imports $7.05B
2019 to 2024
Top exporters
  1. China28.9%
  2. Switzerland * partner reported12.7%
  3. Germany7.8%
Top importers
  1. United States49.7%
  2. China11.9%
  3. India * partner reported3.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Endothall?

The monohydrate is in the form of colorless crystals. Non corrosive. Used as a selective herbicide.

What is the CAS number of Endothall?

The CAS registry number of Endothall is 145-73-3. Other or deprecated CAS numbers: 28871-63-8, 28874-46-6.

What is the molecular formula and weight of Endothall?

The molecular formula of Endothall is C8H10O5 and its molar mass is 186.16 g/mol.

What is Endothall used for?

Algaecide, defoliant/desiccant, herbicide, plant growth regulator. Aquatic herbicide to control submerged aquatic vegetation and algae in lakes, ponds, and irrigation canals. Endothall has one biocide use to control mollusks and algae in cooling towers/systems. Use classes: Herbicides.

Is Endothall hazardous?

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

What is the HS code of Endothall?

Endothall is usually classified under HS code 293299 (Heterocyclic compounds with oxygen hetero-atom(s) only, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Endothall?

CompoundList lists 2 suppliers of Endothall in Canada. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Endothall?

Suppliers quote Endothall 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 Endothall

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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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