InChI=1S/C19H17FN2O6/c1-2-7-21-12-8-13(15(20)16(25)17(12)28-9-14(23)24)22-18(26)10-5-3-4-6-11(10)19(22)27/h1,8,21,25H,3-7,9H2,(H,23,24)