InChI=1S/C17H20O6S/c1-3-16(18)12-9-10-14-17(19)13-8-6-4-5-7-11-15(2)23-24(20,21)22/h3,8,13,15H,1,4-7,11H2,2H3,(H,20,21,22)/b13-8+