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Aromatic building blocks

Questin

Also known as 1,6-dihydroxy-8-methoxy-3-methylanthracene-9,10-dione, Emodin-8-methyl ether, 1,6-dihydroxy-8-methoxy-3-methylanthraquinone

CAS 3774-64-9Formula C16H12O5Molar mass 284.27 g/mol
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Questin chemical structure, C16H12O5, CAS 3774-64-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
3774-64-9
Formula
C16H12O5
Molar mass
284.27 g/mol
HS code
291469
Category
Aromatic building blocks

What is Questin?

Plain description, key identifiers and synonyms

Questin is a dihydroxyanthraquinone that is 1,6-dihyroxy-9,10-anthraquinone which is substituted by a methyl group at position 3 and a methoxy group at position 8. It is functionally related to an emodin. It is a conjugate acid of a questin-2-olate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
1,6-dihydroxy-8-methoxy-3-methylanthracene-9,10-dione
CAS number
3774-64-9 CAS number cross-checked
Molecular formula
C16H12O5
UNII
7Z6321X03I
MDL number
MFCD18452287
InChIKey
UUNPIWCQMVNINR-UHFFFAOYSA-N
InChI
InChI=1S/C16H12O5/c1-7-3-9-13(11(18)4-7)16(20)14-10(15(9)19)5-8(17)6-12(14)21-2/h3-6,17-18H,1-2H3
SMILES (canonical and isomeric)
CC1=CC2=C(C(=C1)O)C(=O)C3=C(C2=O)C=C(C=C3OC)O

Synonyms

  • 1,6-dihydroxy-8-methoxy-3-methylanthracene-9,10-dione
  • Emodin-8-methyl ether
  • 1,6-dihydroxy-8-methoxy-3-methylanthraquinone
  • 1,6-dihydroxy-8-methoxy-3-methyl-9,10-anthraquinone
  • 3,8-dihydroxy-1-methoxy-6-methylanthracene-9,10-dione
  • 1,6-dihydroxy-8-methoxy-3-methyl-anthracene-9,10-dione
  • 1,6-dihydroxy-3-methyl-8-(methyloxy)anthracene-9,10-dione
  • emodin-8-questin
  • 9,10-Anthracenedione, 1,6-dihydroxy-8-methoxy-3-methyl-
  • 9,10-Anthracenedione,1,6-dihydroxy-8-methoxy-3-methyl-
  • Emodin 8-O-methylether
  • 1,6-Dihydroxy-8-methoxy-3-methyl-anthraquinone
  • 1,3,8-Trihydroxy-6-methylanthraquinone 1-me ether

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
284.27 g/molcalc.
Exact mass
284.0685 Dacalc.
LogP (octanol/water)
2.19calc.
Topological polar surface area
83.83 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
5calc.
Rotatable bonds
1calc.
Heavy atoms
21calc.
Rings
3calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.13calc.
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=C1c2ccccc2C(=O)c2ccccc21

O=C1c2ccccc2C(=O)c2ccccc21

3 rings, 16 atoms, the Anthraquinone ring system.

2,059 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.

Questin suppliers

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Questin 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

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 Questin is traded under.

HS 2914.69Indicative HS code

Quinones, other

World exports in 2024
$162M
−10.1% vs 2023, imports $157M
2019 to 2024
Top exporters
  1. China32.8%
  2. Netherlands29.3%
  3. Japan13.8%
Top importers
  1. United States23.0%
  2. India * partner reported16.1%
  3. Thailand7.9%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Questin?

Questin is a dihydroxyanthraquinone that is 1,6-dihyroxy-9,10-anthraquinone which is substituted by a methyl group at position 3 and a methoxy group at position 8. It is functionally related to an emodin. It is a conjugate acid of a questin-2-olate.

What is the CAS number of Questin?

The CAS registry number of Questin is 3774-64-9.

What is the molecular formula and weight of Questin?

The molecular formula of Questin is C16H12O5 and its molar mass is 284.27 g/mol.

What is Questin used for?

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

Is Questin hazardous?

No GHS hazard classification for Questin 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 Questin?

Questin is usually classified under HS code 291469 (Quinones, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Questin?

Post a free request on CompoundList and suppliers of Questin will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Questin?

Suppliers quote Questin 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 Questin

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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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