InChI=1S/C21H22O8S/c1-14(4-3-5-15(2)13-28-30(23,24)25)8-10-27-21-16-6-7-20(22)29-19(16)12-18-17(21)9-11-26-18/h5-9,11-12H,3-4,10,13H2,1-2H3,(H,23,24,25)/b14-8?,15-5+