InChI=1S/C20H20O8S/c1-20(11-27-29(23,24)25)7-6-16-18(28-20)5-2-12-8-13(10-26-19(12)16)15-4-3-14(21)9-17(15)22/h2-7,9,13,21-22H,8,10-11H2,1H3,(H,23,24,25)