InChI=1S/C16H21NO6S/c18-14-9-8-13(12-15(14)23-24(20,21)22)6-2-3-7-16(19)17-10-4-1-5-11-17/h3,7-9,12,18H,1-2,4-6,10-11H2,(H,20,21,22)/b7-3+