InChI=1S/C18H20O12/c1-18(2)4-7(19)5-3-6(15(24)25)8(20)13(12(5)30-18)28-17-11(23)9(21)10(22)14(29-17)16(26)27/h3,9-11,14,17,20-23H,4H2,1-2H3,(H,24,25)(H,26,27)