InChI=1S/C24H20O14/c25-11-5-9(2-4-17(27)28)1-3-13(11)35-16-7-10-6-15(12(26)8-14(10)36-23(16)34)37-24-20(31)18(29)19(30)21(38-24)22(32)33/h1-8,18-21,24-26,29-31H,(H,27,28)(H,32,33)/b4-2+