InChI=1S/C28H22O12/c1-37-23-9-15(2-5-17(23)29)10-24(27(34)35)39-26(33)7-4-14-3-6-21(20(32)8-14)38-25-12-16-11-18(30)19(31)13-22(16)40-28(25)36/h2-9,11-13,24,29-32H,10H2,1H3,(H,34,35)/b7-4+