InChI=1S/C28H26O18/c29-13-5-1-11(9-15(13)31)3-7-17(33)43-23(26(40)41)24(44-18(34)8-4-12-2-6-14(30)16(32)10-12)27(42)46-28-21(37)19(35)20(36)22(45-28)25(38)39/h1-10,19-24,28-32,35-37H,(H,38,39)(H,40,41)/b7-3-,8-4-