InChI=1S/C19H16O7/c1-2-3-4-5-6-7-8-9-10-11-12-13-25-19-16(22)14(20)15(21)17(26-19)18(23)24/h2,11-12,14-17,19-22H,1,13H2,(H,23,24)/b12-11-