InChI=1S/C18H13NO9/c20-10-4-9-5-15(18(26)28-14(9)6-11(10)21)27-13-2-1-8(3-12(13)22)17(25)19-7-16(23)24/h1-6,20-22H,7H2,(H,19,25)(H,23,24)