InChI=1S/C21H28O14/c22-6-12-16(28)19(31)21(8-23,34-12)35-20-18(30)17(29)15(27)13(33-20)7-32-14(26)4-2-9-1-3-10(24)11(25)5-9/h1-5,12-13,15-20,22-25,27-31H,6-8H2/b4-2+