InChI=1S/C19H25NO6S/c1-15(2)14-20-19(22)10-8-6-4-3-5-7-9-16-11-12-17(21)18(13-16)26-27(23,24)25/h4,6-13,15,21H,3,5,14H2,1-2H3,(H,20,22)(H,23,24,25)/b6-4+,9-7+,10-8+