InChI=1S/C21H22O15/c1-8(22)33-16(19(29)30)17(20(31)32)35-11(23)7-4-9-2-5-10(6-3-9)34-21-14(26)12(24)13(25)15(36-21)18(27)28/h2-7,12-17,21,24-26H,1H3,(H,27,28)(H,29,30)(H,31,32)/b7-4+