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Indicators and stains

Phenolphthalin

Also known as 2-[Bis(4-hydroxyphenyl)methyl]benzoic acid, Darmol, Mondane Plus

CAS 81-90-3Formula C20H16O4Molar mass 320.34 g/molEC 201-384-4
1 supplier listed
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Phenolphthalin chemical structure, C20H16O4, CAS 81-90-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
81-90-3
Formula
C20H16O4
Molar mass
320.34 g/mol
EC number
201-384-4
HS code
291829
Category
Indicators and stains

What is Phenolphthalin?

Plain description, key identifiers and synonyms

Phenolphthalin is a member of benzoic acids.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
2-[bis(4-hydroxyphenyl)methyl]benzoic acid
CAS number
81-90-3 CAS number cross-checked
EC number
201-384-4
Molecular formula
C20H16O4
UNII
YSD58V84XK
MDL number
MFCD00036135
InChIKey
FFFPYJTVNSSLBQ-UHFFFAOYSA-N
InChI
InChI=1S/C20H16O4/c21-15-9-5-13(6-10-15)19(14-7-11-16(22)12-8-14)17-3-1-2-4-18(17)20(23)24/h1-12,19,21-22H,(H,23,24)
SMILES (canonical and isomeric)
C1=CC=C(C(=C1)C(C2=CC=C(C=C2)O)C3=CC=C(C=C3)O)C(=O)O

Synonyms

  • 2-[Bis(4-hydroxyphenyl)methyl]benzoic acid
  • Darmol
  • Mondane Plus
  • Benzoic acid, 2-[bis(4-hydroxyphenyl)methyl]-
  • Benzoic acid, 2-(bis(4-hydroxyphenyl)methyl)-
  • 2-[Bis(4-hydroxyphenyl)-methyl]benzoic acid
  • 2-(Bis(4-hydroxyphenyl)methyl)benzoic acid
  • Modane Plus
  • 2-(Bis[4-hydroxyphenyl]methyl)benzoic acid
  • alpha,alpha-Bis(4-hydroxyphenyl)-o-toluic acid
  • phenol phthaline
  • Phenolphthalin, >=92%
  • Phenolphthalin [for redox indicator]
  • 2-[Bis(4-hydroxyphenyl)methyl]benzoic acid #
  • 2-(bis-(4-hydroxyphenyl)-methyl)-benzoic acid
  • Phenolphthalin Solution in Methanol, 100ug/mL
  • Phenolphthaloline [For redox reaction indicator]
  • alpha,alpha-Bis(p-hydroxyphenyl)-o-toluic 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
320.34 g/molcalc.
Exact mass
320.1049 Dacalc.
LogP (octanol/water)
3.98calc.
Topological polar surface area
77.76 Ųcalc.
Hydrogen bond donors
3calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
4calc.
Heavy atoms
24calc.
Rings
3calc.
Aromatic rings
3calc.
Fraction sp3 carbons
0.05calc.
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, c1ccc(C(c2ccccc2)c2ccccc2)cc1

c1ccc(C(c2ccccc2)c2ccccc2)cc1

3 rings, 19 atoms, the Triphenylmethane ring system.

1,512 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.

Phenolphthalin suppliers

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Where suppliers are based

1 supplier in 0 countries

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Phenolphthalin price

Indicative price range per kg from live supplier offers

No published prices right now

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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

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2918.29Indicative HS code

Carboxylic acids, (with phenol function but without other oxygen function), their anhydrides, halides…

World exports in 2024
$861M
+0.9% vs 2023, imports $892M
2019 to 2024
Top exporters
  1. China30.5%
  2. South Korea18.3%
  3. Switzerland * partner reported13.3%
Top importers
  1. United States14.7%
  2. Germany13.3%
  3. Japan10.3%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Phenolphthalin?

Phenolphthalin is a member of benzoic acids.

What is the CAS number of Phenolphthalin?

The CAS registry number of Phenolphthalin is 81-90-3.

What is the molecular formula and weight of Phenolphthalin?

The molecular formula of Phenolphthalin is C20H16O4 and its molar mass is 320.34 g/mol.

What is Phenolphthalin used for?

Known uses and roles of Phenolphthalin include indicators and stains in research and laboratory.

Is Phenolphthalin hazardous?

No GHS hazard classification for Phenolphthalin 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 Phenolphthalin?

Phenolphthalin is usually classified under HS code 291829 (Carboxylic acids with phenol function but without other oxygen function, their…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Phenolphthalin?

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

What is the price of Phenolphthalin?

Suppliers quote Phenolphthalin 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 Phenolphthalin

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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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