CompoundList
Sign in
Heterocyclic building blocks

Orexin

Also known as 2-phenyl-1,2-dihydroquinazoline, 1,2-Dihydro-2-phenylquinazoline, phenyldihydrochinazoline

CAS 55661-66-0Formula C14H12N2Molar mass 208.26 g/mol
1 supplier listed
Get quotes See the supplier
Orexin chemical structure, C14H12N2, CAS 55661-66-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
55661-66-0
Formula
C14H12N2
Molar mass
208.26 g/mol
HS code
293359
Category
Heterocyclic building blocks

What is Orexin?

Plain description, key identifiers and synonyms

Orexin is a chemical substance with the molecular formula C14H12N2 and a molar mass of 208.26 g/mol. Its CAS registry number is 55661-66-0. The IUPAC name is 2-phenyl-1,2-dihydroquinazoline.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-phenyl-1,2-dihydroquinazoline
CAS number
55661-66-0
Molecular formula
C14H12N2
InChIKey
WYUZUBVTNKNDIS-UHFFFAOYSA-N
InChI
InChI=1S/C14H12N2/c1-2-6-11(7-3-1)14-15-10-12-8-4-5-9-13(12)16-14/h1-10,14,16H
SMILES (canonical and isomeric)
C1=CC=C(C=C1)C2NC3=CC=CC=C3C=N2

Synonyms

  • 2-phenyl-1,2-dihydroquinazoline
  • 1,2-Dihydro-2-phenylquinazoline
  • phenyldihydrochinazoline

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
208.26 g/molcalc.
Exact mass
208.10 Dacalc.
LogP (octanol/water)
3.23calc.
Topological polar surface area
24.39 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
1calc.
Heavy atoms
16calc.
Rings
3calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.07calc.
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, C1=NC(c2ccccc2)Nc2ccccc21

C1=NC(c2ccccc2)Nc2ccccc21

3 rings, 16 atoms. This chemical is the scaffold itself.

3 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Orexin suppliers

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

See the supplier

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

1 supplier in 1 country

Send one request to many suppliers

Choose up to 10 suppliers or let us match your request. Compare quotes side by side, free.

Choose suppliersPost a request

Orexin price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

Get latest price

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 Orexin is traded under.

HS 2933.59Indicative HS code

Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring, other

World exports in 2024
$18.4B
+10.5% vs 2023, imports $24.8B
2019 to 2024
Top exporters
  1. Ireland43.6%
  2. Switzerland * partner reported26.3%
  3. China7.9%
Top importers
  1. Slovenia30.3%
  2. United States30.1%
  3. Germany15.3%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Orexin?

Orexin is a chemical substance with the molecular formula C14H12N2 and a molar mass of 208.26 g/mol. Its CAS registry number is 55661-66-0. The IUPAC name is 2-phenyl-1,2-dihydroquinazoline.

What is the CAS number of Orexin?

The CAS registry number of Orexin is 55661-66-0.

What is the molecular formula and weight of Orexin?

The molecular formula of Orexin is C14H12N2 and its molar mass is 208.26 g/mol.

What is Orexin used for?

Known uses and roles of Orexin include building blocks in research and laboratory and screening compounds in research and laboratory.

Is Orexin hazardous?

No GHS hazard classification for Orexin is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Orexin?

Orexin is usually classified under HS code 293359 (Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Orexin?

CompoundList lists 1 supplier of Orexin in United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Orexin?

Suppliers quote Orexin 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 Orexin

Get quotes for Orexin

Post one free request with your grade, quantity and destination. Matching suppliers send quotes you can compare side by side.
Post a request Sell Orexin
Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
Embed this structure on your websiteShow code

Paste this code into your page to show the 2D structure of Orexin with a 3D view, its CAS number where known and a link back to this page. Free to use with the link kept.

<iframe src="https://www.compoundlist.com/embed/structure/orexin-55661-66-0" title="Orexin structure on CompoundList" width="360" height="420" style="border:1px solid #E7E2DA;border-radius:12px;max-width:100%" loading="lazy" referrerpolicy="strict-origin-when-cross-origin"></iframe>
Preview the embed

Explore more in Heterocyclic building blocks or HS code 293359

1 supplier
Free quotes, contact stays private
Get quotes