145588-13-2 2(3H)-Furanone, 5-(3,4-dihydroxyphenyl)-3-((3,4-dihydroxyphenyl)methylene)-, (E)- 3-(3,4-Dihydroxybenzylidene)-5-(3,4-dihydroxyphenyl)-2(3H)-furanone BE 23372M BE-23372M