InChI=1/C19H26N2O8S/c1-28-14-8-11(9-15(29-2)17(14)23)4-3-7-30-10-13(19(26)27)21-16(22)6-5-12(20)18(24)25/h3-4,8-9,12-13,23H,5-7,10,20H2,1-2H3,(H,21,22)(H,24,25)(H,26,27)/b4-3+