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CAS 143-74-8

CAS 143-74-8 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 143-74-8
CAS 143-74-8PubChem CID 4766

Phenol Red

Phenol red is 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxyphenyl groups. A pH indicator changing colour from yellow below pH 6.8 to bright pink above pH 8.2, it is commonly used as an indicator in cell cultures and in home swimming pool test kits. It is also used in the (now infrequently performed) phenolsulfonphthalein (PSP) test for estimation of overall blood flow through the kidney. It has a role as a diagnostic agent, an acid-base indicator and a two-colour indicator. It is a member of phenols, a 2,1-benzoxathiole, a sultone and an arenesulfonate ester. — ChEBI

IUPAC name
4-[3-(4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol
Molecular formula
C19H14O5S
Molecular weight
354.4 g/mol
Exact mass
354.05619472 Da
XLogP3
3.0
Topological polar surface area
92.2 Ų
Hydrogen-bond donors
2
Hydrogen-bond acceptors
5
Covalent units
1
Defined stereocentres
0

Also known as

phenolsulfonphthaleinFenolipunaSulphonthalPSP (indicator)PhenolsulphonphthaleinNSC-10459I6G9Y0J1OJCHEBI:31991
16 more reported names
Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis-, (S,S-dioxide)3,3-bis(4-hydroxyphenyl)-3H-2,1??-benzoxathiole-1,1-dioneRefChem:1728812-(Bis(4-hydroxyphenyl)methyliumyl)benzenesulfonate205-609-7SulfonphthalSulphentalPhenolred3,3-Bis(4-hydroxyphenyl)-3H-benzo[c][1,2]oxathiole 1,1-dioxidePhenolsulfonephthaleinPhenol, 4,4'-(1,1-dioxido-3H-2,1-benzoxathiol-3-ylidene)bis-NSC 10459Phenol red solutionPhenol red indicatorC19H14O5S4,4'-(3H-2,1-Benzoxathiol-3-ylidene)diphenol S,S-dioxide
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External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 143-74-8

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How CAS 143-74-8 is used on this site

CAS 143-74-8 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 143-74-8 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.