InChI=1S/C18H21NO6S/c20-16-11-10-15(14-17(16)25-26(22,23)24)8-4-1-2-5-9-18(21)19-12-6-3-7-13-19/h1-2,4-5,8-11,14,20H,3,6-7,12-13H2,(H,22,23,24)/b2-1+,8-4+,9-5+