InChI=1S/C20H18O11S/c1-20(8-21)16(31-32(26,27)28)4-10-2-9(3-14(24)19(10)30-20)12-7-29-15-6-11(22)5-13(23)17(15)18(12)25/h2-3,5-7,16,21-24H,4,8H2,1H3,(H,26,27,28)