InChI=1S/C23H19FN2O7S/c24-20-9-14(12-25)1-2-17(20)13-33-18-5-3-16-11-19(6-4-15(16)10-18)34(31,32)26-21(23(29)30)7-8-22(27)28/h1-6,9-11,21,26H,7-8,13H2,(H,27,28)(H,29,30)/t21-/m1/s1