InChI=1/C22H16O6/c1-25-22(24)17-5-3-2-4-16(17)19-11-8-15(28-19)7-9-18(23)14-6-10-20-21(12-14)27-13-26-20/h2-12H,13H2,1H3/b9-7+ 7BDB7BD1DB84ECE7