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Screening compounds

4PACz

Also known as (4-(9H-Carbazol-9-yl)butyl)phosphonic acid, [4-(9H-Carbazol-9-yl)butyl]phosphonic Acid

CAS 20999-36-4Formula C16H18NO3PMolar mass 303.30 g/molEC 890-384-3
GHS signal word: Warning. Pictograms: Harmful or irritant
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4PACz chemical structure, C16H18NO3P, CAS 20999-36-4
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
20999-36-4
Formula
C16H18NO3P
Molar mass
303.30 g/mol
EC number
890-384-3
HS code
293399
Category
Screening compounds

What is 4PACz?

Plain description, key identifiers and synonyms

4PACz is a chemical substance with the molecular formula C16H18NO3P and a molar mass of 303.30 g/mol. Its CAS registry number is 20999-36-4. The IUPAC name is 4-carbazol-9-ylbutylphosphonic acid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
4-carbazol-9-ylbutylphosphonic acid
CAS number
20999-36-4
EC number
890-384-3
Molecular formula
C16H18NO3P
MDL number
MFCD34705248
InChIKey
VVVLSSBYAHLICL-UHFFFAOYSA-N
InChI
InChI=1S/C16H18NO3P/c18-21(19,20)12-6-5-11-17-15-9-3-1-7-13(15)14-8-2-4-10-16(14)17/h1-4,7-10H,5-6,11-12H2,(H2,18,19,20)
SMILES (canonical and isomeric)
C1=CC=C2C(=C1)C3=CC=CC=C3N2CCCCP(=O)(O)O

Synonyms

  • (4-(9H-Carbazol-9-yl)butyl)phosphonic acid
  • [4-(9H-Carbazol-9-yl)butyl]phosphonic 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

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
303.30 g/molcalc.
Exact mass
303.1024 Dacalc.
LogP (octanol/water)
3.75calc.
Topological polar surface area
62.46 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
5calc.
Heavy atoms
21calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.25calc.
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, c1ccc2c(c1)[nH]c1ccccc12

c1ccc2c(c1)[nH]c1ccccc12

3 rings, 13 atoms, the Carbazole ring system.

1,549 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
Precautionary statements (9)
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • 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.

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

4PACz suppliers

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4PACz price

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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

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 4PACz is traded under.

HS 2933.99Indicative HS code

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

World exports in 2024
$12.1B
−31.0% vs 2023, imports $28.8B
2019 to 2024
Top exporters
  1. China30.5%
  2. India * partner reported16.3%
  3. Ireland9.0%
Top importers
  1. Slovenia31.7%
  2. Italy24.2%
  3. United States5.0%

* Partner reported figures, a lower bound.

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

The HS code shown for 4PACz is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about 4PACz, based on the data on this page

Is 4PACz hazardous?

4PACz carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

Guides for buyers

Practical guides that help when you source, ship or handle 4PACz

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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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