InChI=1S/C19H18O9/c1-9-8-12(26-15(24)6-4-13(20)21)10-2-3-11-19(27-11)17(10)18(9)28-16(25)7-5-14(22)23/h2-3,8,11,19H,4-7H2,1H3,(H,20,21)(H,22,23)