InChI=1S/C19H16O7/c1-22-11-7-12-14(8-6-13(23-2)26-19(8)25-12)18-16(11)17(21)15-9(20)4-3-5-10(15)24-18/h3-5,7-8,13,19-20H,6H2,1-2H3/t8-,13+,19-/m0/s1