InChI=1S/C21H22O8S/c1-21(2)9-8-15-17(28-21)7-4-12-10-13(11-27-18(12)15)14-5-6-16(22)20(19(14)26-3)29-30(23,24)25/h4-9,13,22H,10-11H2,1-3H3,(H,23,24,25)