InChI=1S/C17H21NO7S/c19-17(18-9-2-1-3-10-18)6-4-5-14(25-26(20,21)22)13-7-8-15-16(11-13)24-12-23-15/h4,6-8,11,14H,1-3,5,9-10,12H2,(H,20,21,22)/b6-4+