InChI=1S/C31H23NO9/c1-3-4-5-6-14-10-13-9-12-7-8-15-20(18(12)27(36)19(13)31(40)32-14)28(37)24-23(25(15)34)30(39)22-21(29(24)38)16(33)11-17(41-2)26(22)35/h3-6,9-11,33-37H,7-8H2,1-2H3,(H,32,40)/b4-3+,6-5+