(3E)-6-hydroxy-3-[(4-hydroxyphenyl)methylidene]-1-benzofuran-2-one
(3E)-6-hydroxy-3-[(4-hydroxyphenyl)methylene]benzofuran-2-one
(3E)-6-hydroxy-3-[(4-hydroxyphenyl)methylene]-2-benzofuranone
(3E)-6-hydroxy-3-(4-hydroxybenzylidene)benzofuran-2-one