InChI=1S/C27H28O12/c1-36-19-11-15(3-7-17(19)28)5-9-23(30)38-21-13-27(35,26(33)34)14-22(25(21)32)39-24(31)10-6-16-4-8-18(29)20(12-16)37-2/h3-12,21-22,25,28-29,32,35H,13-14H2,1-2H3,(H,33,34)/b9-5+,10-6+