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Central nervous system drugs

Paliperidone

Also known as 9-Hydroxyrisperidone, Invega, Paliperidona

CAS 144598-75-4Formula C23H27FN4O3Molar mass 426.49 g/molEC 620-493-1
GHS signal word: Danger. Pictograms: Acute toxicity (severe) 151 suppliers listed Drug substance
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Paliperidone chemical structure, C23H27FN4O3, CAS 144598-75-4
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Crystals from 2-propanol
Melting point
179.8 °C
Solubility
Slightly soluble in dimethylformide, sparingly soluble in 0.1 N HCl, methylene chloride,…
HS code
293499
Category
Central nervous system drugs
Illustrative photo, closed blue fibre drums on a pallet in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Paliperidone?

Plain description, key identifiers and synonyms

3-{2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl}-9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one is a member of the class of pyridopyrimidines that is 9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one carrying an additional 2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl group at position 2. It is a secondary alcohol, an organofluorine compound, a pyridopyrimidine, a heteroarylpiperidine and a member of 1,2-benzoxazoles.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
3-[2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl]-9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one
CAS number
144598-75-4 CAS number cross-checked
EC number
620-493-1
Molecular formula
C23H27FN4O3
UNII
838F01T721
MDL number
MFCD00871802, MFCD09955571
InChIKey
PMXMIIMHBWHSKN-UHFFFAOYSA-N
InChI
InChI=1S/C23H27FN4O3/c1-14-17(23(30)28-9-2-3-19(29)22(28)25-14)8-12-27-10-6-15(7-11-27)21-18-5-4-16(24)13-20(18)31-26-21/h4-5,13,15,19,29H,2-3,6-12H2,1H3
SMILES (canonical and isomeric)
CC1=C(C(=O)N2CCCC(C2=N1)O)CCN3CCC(CC3)C4=NOC5=C4C=CC(=C5)F

Synonyms

  • 9-Hydroxyrisperidone
  • Invega
  • Paliperidona
  • 4H-Pyrido[1,2-a]pyrimidin-4-one, 3-[2-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-
  • 3-{2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl}-9-hydroxy-2-methyl-4H,6H,7H,8H,9H-pyrido[1,2-a]pyrimidin-4-one
  • 4H-Pyrido(1,2-a)pyrimidin-4-one, 3-(2-(4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl)ethyl)-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-
  • (9RS)-3-(2-(4-(6-Fluoro-1,2-benzisoxazol-3-yl)piperidin-1-yl))ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido(1,2-a)pyrimidin-4-one
  • 4H-Pyrido(1,2-a)pyrimidin-4-one, 3-(2-(4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl)ethyl)-6,7,8-tetrahydro-9-hydroxy-2-methyl-
  • 4H-Pyrido(2,1-a)pyrimidin-4-one, 6,7,8,9-tetrahydro-3-(2-(4-(6-fluro-1,2-benzisoxazol-3-yl)-1-piperidinyl)ethyl)-9-hydroxy-2-methyl-
  • paliperidonum
  • Trevicta
  • 9 OH risperidone
  • (9RS)-3-[2-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)piperidin-1-yl]]ethyl]-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
  • 3-(2-(4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-4H,6H,7H,8H,9H-pyrido(1,2-a)pyrimidin-4-one
  • 9 Hydroxyrisperidone
  • 9 Hydroxy risperidone
  • 3-(2-(4-(6-fluoro-3-(1,2-benzisoxazolyl))-1-piperidinyl)ethyl)-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-4H-pyrido(1,2-a)pyrimidin-4-one
  • 9-Hydroxy-risperidone
  • 3-[2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl]-9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one
  • 3-(2-(4-(6-fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
  • 3-[2-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]ethyl]-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-4H-pyrido[1,2-a]pyrimidin-4-one
  • 6,7,8,9-Tetrahydro-3-(2-(4-(6-fluro-1,2-benzisoxazol-3-yl)-1-piperidinyl)ethyl)-9-hydroxy-2-methyl-4H-pyrido[2,1-a]pyrimidin-4-one
  • 9-hydroxy risperidone
  • (9RS)-3-[2-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)piperidin-1-yl]ethyl]-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
  • 3-{2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl}-9-hydroxy-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
Show all 33 synonyms
  • Palliperidone
  • Rac 9-hydroxy risperidone
  • 3-(2-(4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl)ethyl)-6,7,8,9-tetrahydro-9-hydroxy-2-methyl-4H-pyrido(1,2-a)pyrimidin-4-one
  • 3-{2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl}-9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one
  • 144598-75-4 (free base)
  • Invega (TN)
  • Paliperidone (Standard)
  • Risperidone-M 9-hydroxy

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
Crystals from 2-propanolexp.
Melting point
179.8 °Cexp.
Solubility
Slightly soluble in dimethylformide, sparingly soluble in 0.1 N HCl, methylene chloride, practically insoluble in water, hexane, 0.1 N NaOHexp.

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
426.49 g/molcalc.
Exact mass
426.2067 Dacalc.
LogP (octanol/water)
3.08calc.
Topological polar surface area
84.39 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
6calc.
Rotatable bonds
4calc.
Heavy atoms
31calc.
Rings
5calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.52calc.
Formal charge
0calc.
Stereocentres
1calc.
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=c1c(CCN2CCC(c3noc4ccccc34)CC2)cnc2n1CCCC2

O=c1c(CCN2CCC(c3noc4ccccc34)CC2)cnc2n1CCCC2

5 rings, 28 atoms.

43 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.
Precautionary statements (7)
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • 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

Paliperidone suppliers

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All 151 suppliers
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Where suppliers are based

151 suppliers in 24 countries

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Paliperidone 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

Antipsychotic Agent.

Roles

  • H1-receptor antagonist
  • adrenergic agent
  • adrenergic antagonist
  • alpha-adrenergic antagonist
  • alpha-adrenergic drug
  • antidepressant
  • antipsychotic agent
  • anxiolytic drug
  • central nervous system depressant
  • central nervous system drug
  • dopaminergic agent
  • dopaminergic antagonist
  • drug metabolite
  • histamine antagonist
  • histaminergic drug
  • neuroprotective agent
  • neurotransmitter agent
  • pharmaceutical
  • protective agent
  • psychotropic drug
  • second generation antipsychotic
  • serotonergic antagonist
  • serotonergic drug
  • tranquilizing drug

Pharmacology

Paliperidone is an Atypical Antipsychotic.

How it is made

Preparation: C. G. M. Janssen et al., European Patent Office 368388, eidem, United States of America patent 5158952 (1990, 1992 both to Janssen)

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • Active ingredient in FDA approved drug labels

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2934.99Indicative HS code

Nucleic acids and their salts, other heterocyclic compounds, not elsewhere classified in heading 2934

World exports in 2024
$26.7B
+15.0% vs 2023, imports $26.3B
2019 to 2024
Top exporters
  1. Ireland26.3%
  2. China15.7%
  3. Singapore10.3%
Top importers
  1. United States24.5%
  2. Germany23.1%
  3. Japan4.5%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Paliperidone?

3-{2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]ethyl}-9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one is a member of the class of pyridopyrimidines that is 9-hydroxy-2-methyl-6,7,8,9-tetrahydropyrido[1,2-a]pyrimidin-4-one carrying an additional 2-[4-(6-fluoro-1,2-benzoxazol-3-yl)piperidin-1-yl]…

What is the CAS number of Paliperidone?

The CAS registry number of Paliperidone is 144598-75-4.

What is the molecular formula and weight of Paliperidone?

The molecular formula of Paliperidone is C23H27FN4O3 and its molar mass is 426.49 g/mol.

What is Paliperidone used for?

Antipsychotic Agent.

Is Paliperidone hazardous?

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

What is the HS code of Paliperidone?

Paliperidone is usually classified under HS code 293499 (Nucleic acids and their salts, whether or not chemically defined, other heterocyclic…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Paliperidone?

CompoundList lists 151 suppliers of Paliperidone in China, United States, India, Germany and 20 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Paliperidone in India?

26 suppliers in India list Paliperidone on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Paliperidone?

Suppliers quote Paliperidone 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 Paliperidone

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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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