InChI=1S/C21H31NO7S/c22-16(21(28)29)15-30-18(17(23)11-10-14-20(26)27)12-8-6-4-2-1-3-5-7-9-13-19(24)25/h1-2,4-8,12,16-18,23H,3,9-11,13-15,22H2,(H,24,25)(H,26,27)(H,28,29)/b2-1-,6-4+,7-5-,12-8+/t16-,17+,18-/m1/s1