Phenolphthalein dimethyl ether

3,3-Bis(4-methoxyphenyl)-1(3H)-isobenzofuranone

4,4'-[1(3H)-Oxoisobenzofuran-3-ylidene]bisanisole

3,3-Bis(4-methoxyphenyl)-1,3-dihydroisobenzofuran-1-one

4,4'-[3-Oxoisobenzofuran-1(3H)-ylidene]bis(1-methoxybenzene)