C20H14O4
318.3 g/mol
APIDanger
Phenolphthalein
CAS77-09-8EC201-004-7
Category
API
Compound Class
Ester
Primary Use
Pharmaceutical Raw Material
Phenolphthalein is a chemical compound widely used as a pH indicator, with a color transition in the pH range of 8. 2–9.
pH indicatorlaboratory reagentanalytical reagent
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
Restricted or banned substances
Substances on this list are banned or restricted under the named regulation. This page is a compliance reference — verify your obligations under applicable law.
Relevant lists:California Proposition 65
CAS 77-09-8
Related Compounds
ReferenceSame Category
Butalbital
CAS77-26-9
pharmaceutical raw material
ReferenceSame Category
Chlorthalidone
CAS77-36-1
pharmaceutical raw material
ReferenceSame Category
Meparfynol
CAS77-75-8
pharmaceutical raw material
ReferenceSame Category
Tromethamine
CAS77-86-1
pharmaceutical raw material
Referencesame scaffold
O-cresolphthalein
CAS596-27-0
pH indicator for titrations
Referencesame scaffold
Thymolphthalein
CAS125-20-2
pH indicator dye
Safety Reference
Danger
H341Suspected of causing genetic defects
H350May cause cancer
H361Suspected of damaging fertility or the unborn child
H401Toxic to aquatic life
H412Harmful to aquatic life with long lasting effects
H351Suspected of causing cancer
H360May damage fertility or the unborn child
H372Causes damage to organs through prolonged or repeated exposure
H317May cause an allergic skin reaction
H319Causes serious eye irritation
Customs Tariff Classification
The international HS code for Phenolphthalein (CAS 77-09-8) is 2932.20.
HS code (international, 6-digit)
2932.20
EU CN code (8-digit)
2932 20 10
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one
InChIKey
KJFMBFZCATUALV-UHFFFAOYSA-N
SMILES
C1=CC=C2C(=C1)C(=O)OC2(C3=CC=C(C=C3)O)C4=CC=C(C=C4)O
Synonyms (86)
- FGT
- Fenolftaleina [INN-Spanish]
- Phenolphtaleine [INN-French]
- Phenolphthalein (INN)
- Phenolphthalein, United States Pharmacopeia (USP)
- Phenolphthaleinum [INN-Latin]
- USP Solution Phenolphthalein TS/RS Conforms to USP
- Agoral
- Agoral (Salt/Mix)
- Alophen
- Chocolax
- Colax
- Correctol
- Dihydroxyphthalophenone
- Doxan (Salt/Mix)
- Espotabs
- Euchessina
- Evac-Q-Kit
- Evac-Q-Kwik
- Evac-U-Gen
- Ex-Lax
- Feen-A-Mint Laxative Mints
- FemiLax
- Fenolftalein
- Fenolftalein [Czech]
- Fenolftaleina
- Koprol
- Laxcaps (Salt/Mix)
- Laxettes
- Laxin
- Laxogen
- Medilax
- Modane (TN)
- Modane Plus (Salt/Mix)
- PHENOLPHTHALEIN [MART.]
- Phenolax
- Phenolphtaleine
- Phenolphthalein M.P. RS
- Phenolphthalein Paper, DAB 6
- Phenolphthalein solution
- Phenolphthalein, p.a.
- Phenolphthalein, pH indicator
- Phenolphthalein,white
- Phenolphthalein,yellow
- Phenolphthaleinum
- Phenophthalein
- Phillips Gelcaps
- Phthalimetten
- Phthalin
- Prulet
- Purga
- Purgen
- Purgophen
- Spulmako-lax
- Trilax
- Yellow phenolphthalein
- component of Agoral
- component of Correctol
- phenolphtalein
- phenolphthalein