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Herbicides

Naptalam

Also known as Grelutin, N-1-Naphthylphthalamic acid, N-(1-Naphthyl)phthalamic acid

CAS 132-66-1Formula C18H13NO3Molar mass 291.31 g/molEC 625-029-1
18 suppliers listed
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Naptalam chemical structure, C18H13NO3, CAS 132-66-1
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Crystalline solid powder, purple
Melting point
203 °C
Density
1.40 @ 20 °C/4 °C
Solubility
INSOL IN HEXANE, XYLENE, BENZENE, PPM @ 25 °C: ACETONE 5,000, ISOPROPANOL 2,100, CARBON…
HS code
292429
Category
Herbicides
Illustrative photo, blue pigment powder in a glass jar on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Naptalam?

Plain description, key identifiers and synonyms

Naptalam is a dicarboxylic acid monoamide which results from addition of one equivalent of 1-naphthylamine to phthalic anhydride. It has a role as a herbicide. It is a carboxylic acid, a dicarboxylic acid monoamide and a N-(1-naphthyl)carboxamide. It is a conjugate acid of a naptalamate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-(naphthalen-1-ylcarbamoyl)benzoic acid
CAS number
132-66-1 CAS number cross-checked
EC number
625-029-1
Molecular formula
C18H13NO3
UNII
306R88V86P
MDL number
MFCD00037725
InChIKey
JXTHEWSKYLZVJC-UHFFFAOYSA-N
InChI
InChI=1S/C18H13NO3/c20-17(14-9-3-4-10-15(14)18(21)22)19-16-11-5-7-12-6-1-2-8-13(12)16/h1-11H,(H,19,20)(H,21,22)
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C=CC=C2NC(=O)C3=CC=CC=C3C(=O)O

Synonyms

  • Grelutin
  • N-1-Naphthylphthalamic acid
  • N-(1-Naphthyl)phthalamic acid
  • Alanape
  • Analape
  • Dyanap
  • Peach-Thin
  • Mor-Cran
  • Naphthalam
  • Alanap 1
  • Alanap 3
  • Alanap 10G at
  • Alanap-2
  • Naptalame
  • Cyanap
  • Naptro
  • 1-N-Naphthylphthalamic acid
  • Alanap Plus
  • alpha-Naphthylphthalamic acid
  • Naftalam
  • N-1-Naphthyl-phthalamidsaeure
  • Alanap 10G
  • Peach Thin 322
  • Phthalamic acid, N-1-naphthyl-
  • ACP 322
Show all 38 synonyms
  • N-1-Naphthylphthalamate
  • N-alpha-Naphthylphthalamic acid
  • 2-((1-Naphthalenylamino)carbonyl)benzoic acid
  • Naphthylphthalamic acid
  • N-1-Naphthalenephthalamic acid
  • 2-[(1-naphthalenylamino)carbonyl]benzoic acid
  • 1-Naphthylphthalamic acid
  • n-naphthylphthalamic acid
  • 1-N-naphthylphtalamic acid
  • MorCran
  • 2-(naphthalen-1-ylcarbamoyl)benzoic acid
  • Alanap
  • Ancrack

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
Crystalline solid powder, purpleexp.
Odour
UNPLEASANTexp.
Melting point
203 °Cexp.
Density
1.40 @ 20 °C/4 °Cexp.
Solubility
INSOL IN HEXANE, XYLENE, BENZENE, PPM @ 25 °C: ACETONE 5,000, ISOPROPANOL 2,100, CARBON TETRACHLORIDE 100, WATER 200, DIMETHYLFORMAMIDE 39,400, DIMETHYL SULFOXIDE 43,100, METHYLETHYL KETONE 3,700exp.
Vapour pressure
Less than 133 Pascals at 20 °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
291.31 g/molcalc.
Exact mass
291.0895 Dacalc.
LogP (octanol/water)
3.79calc.
Topological polar surface area
66.4 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
3calc.
Heavy atoms
22calc.
Rings
3calc.
Aromatic rings
3calc.
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=C(Nc1cccc2ccccc12)c1ccccc1

O=C(Nc1cccc2ccccc12)c1ccccc1

3 rings, 19 atoms, the N-1-Naphthylbenzamide ring system.

152 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS classification
Hazard pictograms

Hazard statements

  • H412Harmful to aquatic life with long lasting effects.
Precautionary statements (2)
  • P273Avoid release to the environment.
  • 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

Naptalam suppliers

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

All 18 suppliers
18 of 18 offers
  • 1st Scientific LLC
    China, NanjingUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
    View
  • AChemBlock
    United States, HaywardUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
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  • AgroIntelBioScan.com
    Singapore, SingaporeUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
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  • Angel Pharmatech Ltd.
    China, ShanghaiUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
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  • Avantor Inc.
    United States, Radnor ManufacturerUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
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  • Chem-Impex
    United States, Wood DaleUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
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  • ChemBridge Corporation
    United States, San DiegoUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
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  • ChemDiv Inc.
    United States, San DiegoUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
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  • Chemenu. Inc.
    China, ShanghaiUnclaimed profile
    NaptalamGrade, purity and minimum order on request
    Price on request
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  • Clearsynth
    United States, San DiegoUnclaimed profile
    NaptalamGrade, 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

18 suppliers in 6 countries

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Naptalam 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

The active ingredient is no longer contained in any registered pesticide products ... "cancelled.".

As analytical reagent for thorium & zirconium.

Gives control of pigweed, purslane, lambsquarter, quickweed, ragweed, chickweed, foxtail, crabgrass.

It ... Has shown some promise for weed control in irrigated cotton in west. Npa has been recently cancelled for food crop use.

Pharmacological actions

  • Herbicides
  • Plant Growth Regulators

Roles

  • herbicide
  • pesticide

How it is made

By the interaction of phthalic anhydride with 1-naphthylamine in benzene, xylene, or kerosene at room temp.

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 Naptalam is traded under.

HS 2924.29Indicative HS code

Cyclic amides (including cyclic carbamates) and their derivatives, salts thereof, other

World exports in 2024
$5.69B
−5.1% vs 2023, imports $5.8B
2019 to 2024
Top exporters
  1. China32.3%
  2. Switzerland * partner reported13.6%
  3. Norway * partner reported12.8%
Top importers
  1. United States15.9%
  2. Ireland15.8%
  3. Germany11.9%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Naptalam?

Naptalam is a dicarboxylic acid monoamide which results from addition of one equivalent of 1-naphthylamine to phthalic anhydride. It has a role as a herbicide. It is a carboxylic acid, a dicarboxylic acid monoamide and a N-(1-naphthyl)carboxamide. It is a conjugate acid of a naptalamate.

What is the CAS number of Naptalam?

The CAS registry number of Naptalam is 132-66-1.

What is the molecular formula and weight of Naptalam?

The molecular formula of Naptalam is C18H13NO3 and its molar mass is 291.31 g/mol.

What is Naptalam used for?

The active ingredient is no longer contained in any registered pesticide products ... "cancelled.". As analytical reagent for thorium & zirconium. Gives control of pigweed, purslane, lambsquarter, quickweed, ragweed, chickweed, foxtail, crabgrass. It ...

Is Naptalam hazardous?

Naptalam has a GHS hazard classification. Main hazards: harmful to aquatic life with long lasting effects. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Naptalam?

Naptalam is usually classified under HS code 292429 (Cyclic amides (including cyclic carbamates) and their derivatives, salts thereof, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Naptalam?

CompoundList lists 18 suppliers of Naptalam in United States, China, Canada, Hong Kong and 2 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Naptalam?

Suppliers quote Naptalam 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

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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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