InChI=1S/C31H22O10/c1-3-4-5-6-14-10-13-9-12-7-8-15-20(18(12)27(35)19(13)31(39)41-14)28(36)24-23(25(15)33)30(38)22-21(29(24)37)16(32)11-17(40-2)26(22)34/h3-6,9-11,32-36H,7-8H2,1-2H3/b4-3+,6-5+