InChI=1S/C18H16O6/c19-7-1-2-11-3-6-15-16(8-11)23-17(10-20)18(24-15)12-4-5-13(21)14(22)9-12/h1-9,17-18,20-22H,10H2/t17-,18-/m0/s1