InChI=1S/C27H28O14/c1-9(8-28)4-5-12-11(3)21-15(7-13(12)29)38-22-16(26(37)40-21)10(2)6-14(17(22)24(33)34)39-27-20(32)18(30)19(31)23(41-27)25(35)36/h4,6-7,18-20,23,27-32H,5,8H2,1-3H3,(H,33,34)(H,35,36)/b9-4+