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