InChI=1S/C21H25FN2O4/c1-17(25)24-20-7-4-18(5-8-20)2-3-19-6-9-21(23-16-19)28-15-14-27-13-12-26-11-10-22/h2-9,16H,10-15H2,1H3,(H,24,25)/b3-2+/i22-1