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Insecticides and acaricides

Malaoxon

Also known as Liromat, Oxycarbophos, Malaoxone

CAS 1634-78-2Formula C10H19O7PSMolar mass 314.30 g/molEC 634-923-0
GHS signal word: Danger. Pictograms: Acute toxicity (severe) 2 suppliers listed
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Malaoxon chemical structure, C10H19O7PS, CAS 1634-78-2
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Liquid
Melting point
<20
Boiling point
113.9 °C
Density
1.235 at 70 °F - Denser than water, will sink
Flash point
>100
HS code
293090
Category
Insecticides and acaricides
UN number
UN 3018
Illustrative photo, closed blue jerry cans in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Malaoxon?

Plain description, key identifiers and synonyms

Diethyl 2-[(dimethoxyphosphoryl)thio]succinate is a diester that is diethyl succinate in which position 2 is substituted by a (dimethoxyphosphoryl)thio group. It is an ethyl ester, an organic thiophosphate and a diester.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
diethyl 2-dimethoxyphosphorylsulfanylbutanedioate
CAS number
1634-78-2 CAS number cross-checked
EC number
634-923-0
Molecular formula
C10H19O7PS
UNII
2439JYF84Q
MDL number
MFCD00055461
InChIKey
WSORODGWGUUOBO-UHFFFAOYSA-N
InChI
InChI=1S/C10H19O7PS/c1-5-16-9(11)7-8(10(12)17-6-2)19-18(13,14-3)15-4/h8H,5-7H2,1-4H3
SMILES (canonical and isomeric)
CCOC(=O)CC(C(=O)OCC)SP(=O)(OC)OC

Synonyms

  • Liromat
  • Oxycarbophos
  • Malaoxone
  • Maloxon
  • Carbethoxy malaoxon
  • diethyl 2-dimethoxyphosphorylsulfanylbutanedioate
  • Malathion oxon
  • O,O-Dimethyl S-1,2-bis(ethoxycarbonyl)ethyl phosphorothioate
  • DL-Malaoxon
  • Diethyl mercaptosuccinate S-ester with O,O-dimethyl phosphorothioate
  • O,O-Dimethyl-S-(1,2-dicarbethoxy)ethyl phosphorothioate
  • S-(1,2-Diethoxycarbonyl)ethyl O,O-dimethyl phosphorothioate
  • Butanedioic acid, ((dimethoxyphosphinyl)thio)-, diethyl ester
  • Succinic acid, mercapto-, diethyl ester, S-ester with O,O-dimethyl phosphorothioate
  • O,O-Dimethyl S-(1,2-dicarbethoxy)ethyl phosphorothioate
  • O,O-Dimethyl-S-1,2-bis(ethoxycarbonyl)ethyl phosphorothioate
  • Succinic acid, mercapto-, diethyl ester, S-ester with O,O-dimethylphosphorothioate
  • succinic acid, mercapto-, diethyl ester, dimethyl phosphate
  • Butanedioic acid, [(dimethoxyphosphinyl)thio]-, diethyl ester
  • Diethyl ((dimethoxyphosphino)thio)butanedioate
  • diethyl((dimethoxyphosphinyl)thio)butanedioate
  • diethyl 2-((dimethoxyphosphoryl)thio)succinate
  • diethyl 2-[(dimethoxyphosphoryl)thio]succinate
  • Phosphorothioic acid, O,O-dimethyl ester, S-ester with 1,2-bis(ethoxycarbonyl)ethanethiol
  • Malaoxan
Show all 34 synonyms
  • Butanedioic acid, 2-((dimethoxyphosphinyl)thio)-, 1,4-diethyl ester
  • Butanedioic acid, 2-[(dimethoxyphosphinyl)thio]-, 1,4-diethyl ester
  • Malathion impurity B CRS
  • Malathion impurity b
  • Malaoxon, PESTANAL(R), analytical standard
  • Diethyl 2-[(dimethoxyphosphoryl)sulfanyl]succinate #
  • Diethyl 2-[(dimethoxyphosphoryl)sulfanyl]butanedioate
  • Malathion impurity B, European Pharmacopoeia (EP) Reference Standard
  • Phosphorothioic acid, O,O-dimethyl ester, S-ester with diethyl mercaptosuccinate

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

Physical form
Liquidexp.
Melting point
<20exp.
Boiling point
113.9 °Cexp.
Density
1.235 at 70 °F - Denser than water, will sinkexp.
Flash point
>100exp.
Solubility
5 to 10 mg/mL at 72 °Fexp.
Vapour pressure
9.8e-06 mmHg at 68 °F, 0.00032 mmHg at 122 °Fexp.

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
314.30 g/molcalc.
Exact mass
314.0589 Dacalc.
LogP (octanol/water)
2.01calc.
Topological polar surface area
88.13 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
8calc.
Rotatable bonds
9calc.
Heavy atoms
19calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.8calc.
Formal charge
0calc.
Stereocentres
1calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

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.
  • H310Fatal in contact with skin.
Precautionary statements (12)
  • P262Do not get in eyes, on skin, or on clothing.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • 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.
  • P316Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P361 + P364Take off immediately all contaminated clothing. And wash it before reuse.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 3018

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

Malaoxon suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 2 suppliers
  • JieJie Group Co., Ltd.
    China, Shanghai ManufacturerUnclaimed profile
    MalaoxonGrade, purity and minimum order on request
    Price on request
    View
  • Veeprho
    Czech Republic, Czech RepublicUnclaimed profile
    MalaoxonGrade, purity and minimum order on request
    Price on request
    View

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

2 suppliers in 2 countries

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Malaoxon 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

/SRP/: Malaoxon is a biochemical or photolytic product of malathion.

Use classes: Pharmaceuticals.

Pharmacological actions

  • Insecticides

Roles

  • acaricide
  • agrochemical
  • enzyme inhibitor
  • insecticide
  • pediculicide
  • pesticide
  • scabicide

How it is made

Oxidation of malathion

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2930.90Indicative HS code

Organo-sulphur compounds, other

World exports in 2024
$5.83B
+0.1% vs 2023, imports $5.93B
2019 to 2024
Top exporters
  1. China40.7%
  2. United States10.9%
  3. Japan9.3%
Top importers
  1. United States13.3%
  2. Brazil12.6%
  3. China6.6%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Malaoxon?

Diethyl 2-[(dimethoxyphosphoryl)thio]succinate is a diester that is diethyl succinate in which position 2 is substituted by a (dimethoxyphosphoryl)thio group. It is an ethyl ester, an organic thiophosphate and a diester.

What is the CAS number of Malaoxon?

The CAS registry number of Malaoxon is 1634-78-2.

What is the molecular formula and weight of Malaoxon?

The molecular formula of Malaoxon is C10H19O7PS and its molar mass is 314.30 g/mol.

What is Malaoxon used for?

/SRP/: Malaoxon is a biochemical or photolytic product of malathion. Use classes: Pharmaceuticals.

Is Malaoxon hazardous?

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

What is the HS code of Malaoxon?

Malaoxon is usually classified under HS code 293090 (Organo-sulphur compounds, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Malaoxon?

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

What is the price of Malaoxon?

Suppliers quote Malaoxon 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 Malaoxon

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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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