InChI=1S/C21H22N2O7S/c1-4-30-18-10-13(8-9-17(18)25)16(11-31(3,28)29)23-20(26)14-6-5-7-15(22-12(2)24)19(14)21(23)27/h5-10,16,25H,4,11H2,1-3H3,(H,22,24)/t16-/m1/s1