1,3-Dihydro-3,3-bis(4-hydroxy-m-tolyl)-2H-indol-2-one 2H-Indol-2-one, 1,3-dihydro-3,3-bis(4-hydroxy-3-methylphenyl)- 47465-97-4 EINECS 256-318-7 Isatin biscresol