"Hershel B. Prindle, George E. Ham, \"Preparation of phenolphthalein using cation exchange resins and aryl phosphites.\" U.S. Patent US4252725, issued March, 1966."@en . . . "Phenolphthaleinum"@en . . . . . . . . "3,3-Bis(4-hydroxyphenyl)-1(3H)-isobenzofuranone"@en . " "@en . "3,3-Bis(4-hydroxyphenyl)-2-benzofuran-1(3H)-one"@en . "Phenolphthalein"@en . "77-09-8"@en . "Used for over a century as a laxative."@en . . "Humans and other mammals"@en . . "3,3-Bis(p-hydroxyphenyl)phthalide"@en . "withdrawn"@en . "Fenolftalein"@en . "Dihydroxyphthalophenone"@en . . . . . "Fenolftaleina"@en . . . . . . . . "Phenolphthalein was withdrawn in Canada due to concerns with carcinogenicity in 1997."@en . . . . . . "3,3-Bis(4-hydroxyphenyl)phthalide"@en . "Alpha-di(p-hydroxyphenyl)phthalide"@en . . "Phenophthalein"@en . . . . . . . . . . "Phenolphtaleine"@en . . . . . . . .