1,3-benzenediol, 5-(6-hydroxy-2-benzofuranyl)- 5-(6-hydroxy-1-benzofuran-2-yl)benzene-1,3-diol InChI=1/C14H10O4/c15-10-2-1-8-5-13(18-14(8)7-10)9-3-11(16)6-12(17)4-9/h1-7,15-17