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Screening compounds

Sta-21

Also known as STA 21, 8-hydroxy-3-methyl-3,4-dihydrotetraphene-1,7,12(2H)-trione, Ochromycinone (STA-21)

CAS 111540-00-2Formula C19H14O4Molar mass 306.32 g/mol
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Sta-21 chemical structure, C19H14O4, CAS 111540-00-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
111540-00-2
Formula
C19H14O4
Molar mass
306.32 g/mol
HS code
291469
Category
Screening compounds

What is Sta-21?

Plain description, key identifiers and synonyms

Sta-21 is a chemical substance with the molecular formula C19H14O4 and a molar mass of 306.32 g/mol. Its CAS registry number is 111540-00-2. The IUPAC name is 8-hydroxy-3-methyl-3,4-dihydro-2H-benzo[a]anthracene-1,7,12-trione.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
8-hydroxy-3-methyl-3,4-dihydro-2H-benzo[a]anthracene-1,7,12-trione
CAS number
111540-00-2
Molecular formula
C19H14O4
MDL number
MFCD16883374
InChIKey
ZAWXOCUFQSQDJS-UHFFFAOYSA-N
InChI
InChI=1S/C19H14O4/c1-9-7-10-5-6-12-17(15(10)14(21)8-9)19(23)11-3-2-4-13(20)16(11)18(12)22/h2-6,9,20H,7-8H2,1H3
SMILES (canonical and isomeric)
CC1CC2=C(C(=O)C1)C3=C(C=C2)C(=O)C4=C(C3=O)C=CC=C4O

Synonyms

  • STA 21
  • 8-hydroxy-3-methyl-3,4-dihydrotetraphene-1,7,12(2H)-trione
  • Ochromycinone (STA-21)
  • (Rac)-STA-21
  • 8-hydroxy-3-methyl-3,4-dihydro-2H-benzo[a]anthracene-1,7,12-trione
  • Benz[a]anthracene-1,12-trione, 1,2,3,4,7,12-hexahydro-8-hydroxy-3-methyl-
  • (+-)-Ochromycinone
  • (Rac)-STA-21, TA 21
  • 8-Hydroxy-3-methyl-1,2,3,4,7,12-hexahydrotetraphene-1,7,12-trione
  • STA-21, >=95% (HPLC)
  • {Benz[a]anthracene-1,7,12-trione,} 1,2,3
  • 8-Hydroxy-3-Methyl-3,4-Dihydro-1,7,12(2H)-Tetraphenetrione
  • 8-Hydroxy-3-methyl-3,4-dihydrobenzo[a]anthracene-1,7,12(2H)-trione
  • {Benz[a]anthracene-1,7,12-trione,} 1,2,3,4,7, 12-hexahydro-8-hydroxy-3-methyl-

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
306.32 g/molcalc.
Exact mass
306.0892 Dacalc.
LogP (octanol/water)
2.93calc.
Topological polar surface area
71.44 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
0calc.
Heavy atoms
23calc.
Rings
4calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.21calc.
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=C1c2ccccc2C(=O)c2c1ccc1c2C(=O)CCC1

O=C1c2ccccc2C(=O)c2c1ccc1c2C(=O)CCC1

4 rings, 21 atoms.

20 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.

Sta-21 suppliers

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Sta-21 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 Sta-21 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 Sta-21 is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Sta-21, based on the data on this page

What is Sta-21?

Sta-21 is a chemical substance with the molecular formula C19H14O4 and a molar mass of 306.32 g/mol. Its CAS registry number is 111540-00-2. The IUPAC name is 8-hydroxy-3-methyl-3,4-dihydro-2H-benzo[a]anthracene-1,7,12-trione.

What is the CAS number of Sta-21?

The CAS registry number of Sta-21 is 111540-00-2.

What is the molecular formula and weight of Sta-21?

The molecular formula of Sta-21 is C19H14O4 and its molar mass is 306.32 g/mol.

What is Sta-21 used for?

Known uses and roles of Sta-21 include building blocks in research and laboratory and screening compounds in research and laboratory.

Is Sta-21 hazardous?

No GHS hazard classification for Sta-21 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 Sta-21?

Sta-21 is usually classified under HS code 291469 (Quinones, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Sta-21?

Post a free request on CompoundList and suppliers of Sta-21 will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Sta-21?

Suppliers quote Sta-21 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 Sta-21

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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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