InChI=1S/C19H16O7/c1-23-19-17(22)11(3-5-16(20)21)6-12-8-14(26-18(12)19)10-2-4-13-15(7-10)25-9-24-13/h2,4,6-8,22H,3,5,9H2,1H3,(H,20,21)