InChI=1S/C20H23NO8S/c1-26-16-7-5-15(12-18(16)28-3)10-11-21-20(22)9-6-14-4-8-17(27-2)19(13-14)29-30(23,24)25/h4-9,12-13H,10-11H2,1-3H3,(H,21,22)(H,23,24,25)