Phenolphthalein 

Phenolphthalein
IUPAC name[hide] 3,3-bis(4-hydroxyphenyl)isobenzofuran-1(3H)-one
Identifiers
CAS number	77-09-8 Y
PubChem	4764
ChemSpider	4600 Y
DrugBank	DB04824
KEGG	D05456 Y
ChEMBL	CHEMBL63857 Y
Jmol-3D images	Image 1
SMILES [show] O=C1OC(c2ccccc12)(c3ccc(O)cc3)c4ccc(O)cc4
InChI [show] InChI=1S/C20H14O4/c21-15-9-5-13(6-10-15)20(14-7-11-16(22)12-8-14)18-4-2-1-3-17(18)19(23)24-20/h1-12,21-22H Y Key: KJFMBFZCATUALV-UHFFFAOYSA-N Y InChI=1/C20H14O4/c21-15-9-5-13(6-10-15)20(14-7-11-16(22)12-8-14)18-4-2-1-3-17(18)19(23)24-20/h1-12,21-22H Key: KJFMBFZCATUALV-UHFFFAOYAH
Properties
Molecular formula	C20H14O4
Molar mass	318.32 g mol−1
Density	1.277 g cm−3, at 32 °C
Melting point	260 °C
Boiling point	N/A
Solubility in water	Insoluble
Solubility in other solvents	Insoluble in benzene, very soluble in ethanol and ether, slightly soluble in DMSO
N (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)