InChI=1S/C19H16O7/c1-23-17-5-10(2-3-18(21)22)4-11-6-14(26-19(11)17)12-7-15-16(8-13(12)20)25-9-24-15/h4-8,20H,2-3,9H2,1H3,(H,21,22)