InChI=1/C16H14O7/c1-21-14-8-10(3-7-15(17)18)2-5-12(14)22-9-11-4-6-13(23-11)16(19)20/h2-8H,9H2,1H3,(H,17,18)(H,19,20)/p-2/b7-3+/fC16H12O7/q-2 8BB41C6FA40469F9