Phenol Red (CAS 143-74-8) Sigma-Aldrich

Phenol Red molecular structure — Molecular structure

The Sigma-Aldrich catalog lists 5 grades and pack sizes of Phenol Red (CAS 143-74-8). Pick the code you need and request a quote for price and lead time from Klar Chem.

CAS	143-74-8
Molecular formula	C19H14O5S
Molecular weight	354.38 g/mol
IUPAC name	4-[3-(4-hydroxyphenyl)-1,1-dioxo-2,1λ6-benzoxathiol-3-yl]phenol
Synonyms	phenolsulfonphthalein · Fenolipuna · Sulphonthal · Phenolsulphonphthalein · PSP (indicator) · 3,3-bis(4-hydroxyphenyl)-3H-2,1??-benzoxathiole-1,1-dione

Safety & Hazards (GHS) Warning

Irritant

H315 Causes skin irritation
H335 May cause respiratory irritation

⚠️ For information only (source: EU CLP harmonised classification and ECHA notifications, via PubChem); not a substitute for the official Safety Data Sheet (SDS).

Catalog codes and grades

Brand	Product / grade	Code
Sigma	PHENOL RED 0.5% SOLUTION IN DULBECCO'S	P0290-100ML	Request Quote
Sigma	PHENOL RED, A.C.S. REAGENT	114529-25G 114529-5G	Request Quote
Sigma	PHENOL RED, BIOREAGENT CELL CULTURE TES	P3532-25G P3532-5G	Request Quote

For information only; specifications and availability are confirmed at quotation. Prices are not listed.