InChI=1S/C20H18O11S/c1-27-13-7-9(3-5-11(13)21)17-15-16(20(23)29-17)18(30-19(15)22)10-4-6-12(14(8-10)28-2)31-32(24,25)26/h3-8,15-18,21H,1-2H3,(H,24,25,26)