1(3H)-Isobenzofuranone, 3,3-bis(4-hydroxy-3-methylphenyl)- 3',3''-Dimethylphenolphthalein 3,3-Bis(4-hydroxy-m-tolyl)phthalide 5-18-04-00193 (Beilstein Handbook Reference) 596-27-0 80045-63-2 BRN 0310554 Cresolphthalein EINECS 209-881-8 Phenolphthalein, 3',3''-dimethyl- o-Cresolphthalein