InChI=1S/C31H28O13/c1-40-23-10-15(2-8-20(23)35)3-9-26(36)41-24-13-19-21(42-30(24)16-4-6-17(33)7-5-16)11-18(34)12-22(19)43-31-29(39)28(38)27(37)25(14-32)44-31/h2-13,25,27-29,31-32,37-39H,14H2,1H3,(H2-,33,34,35,36)/p+1