InChI=1S/C18H16O7/c19-13-3-1-2-12(8-13)10-16(18(23)24)25-15-6-4-11(9-14(15)20)5-7-17(21)22/h1-9,16,19-20H,10H2,(H,21,22)(H,23,24)/b7-5+