InChI=1/C21H18NO5S/c1-26-18-7-4-8-19-20(18)16-10-9-14(22-28(2,24)25)12-17(16)21(27-19)13-5-3-6-15(23)11-13/h3-12,21,23H,1-2H3/q-1/t21-/m1/s1 2F5909846419A21E