InChI=1S/C21H26O15/c22-6-10-12(25)13(26)16(29)20(34-10)33-9-3-1-7(5-8(9)23)2-4-11(24)35-21-17(30)14(27)15(28)18(36-21)19(31)32/h1-5,10,12-18,20-23,25-30H,6H2,(H,31,32)/b4-2+