InChI=1S/C20H20O8S/c1-20(2)8-7-13-16(27-20)6-5-12(18(13)22)15-10-26-17-9-11(21)3-4-14(17)19(15)28-29(23,24)25/h3-9,15,19,21-22H,10H2,1-2H3,(H,23,24,25)