Chlorophenol red

Chlorophenol red
IUPAC name 2-chloro-4-[3-(3-chloro-4-hydroxyphenyl)-1,1-dioxobenzo[c]oxathiol-3-yl]phenol
Identifiers
CAS number	4430-20-0
PubChem	20486
ChemSpider	21106425 Y
Jmol-3D images	Image 1 Image 2
SMILES C1=CC=C2C(=C1)C(OS2(=O)=O)(C3=CC(=C(C=C3)O)Cl)C4=CC(=C(C=C4)O)Cl Oc1ccccc1Cl.CN(C)C(=O)Nc1ccccc1
InChI InChI=1S/C9H12N2O.C6H5ClO/c1-11(2)9(12)10-8-6-4-3-5-7-8;7-5-3-1-2-4-6(5)8/h3-7H,1-2H3,(H,10,12);1-4,8H Y Key: NYKAIYWZWWMAME-UHFFFAOYSA-N Y InChI=1/C9H12N2O.C6H5ClO/c1-11(2)9(12)10-8-6-4-3-5-7-8;7-5-3-1-2-4-6(5)8/h3-7H,1-2H3,(H,10,12);1-4,8H Key: NYKAIYWZWWMAME-UHFFFAOYAD
Properties
Molecular formula	C19H12Cl2O5S
Molar mass	423.27 g/mol
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Chlorophenol red is an indicator dye that changes color from yellow to violet in the pH range 4.8 to 6.7. The lambda max is at 572 nm.