InChI=1S/C18H16O7/c19-8-12-11-5-9(1-4-16(23)24)6-15(22)18(11)25-17(12)10-2-3-13(20)14(21)7-10/h1-7,12,17,19-22H,8H2,(H,23,24)/b4-1+/t12-,17+/m0/s1